Add documentation and license

Flesh out the README and add complete reference documentation in
`doc/jsonschema.md`. Add tests for the previously-untested
`jsonschema_is_valid()` SQL functions, and tweak the parameter names to
match the docs.

Cargo.toml

@@ -1,12 +1,12 @@
 [package]
 name = "jsonschema"
-version = "0.0.0"
+version = "0.1.0"
 description = "JSONSchema validation in Postgres"
 readme = "README.md"
 repository = "https://github.com/tembo-io/pg-jsonschema"
 authors = ["David E. Wheeler <david@justatheory.com>"]
 keywords = ["jsonschema", "validation", "postgres", "extension", "database", "pgrx"]
-license = "MIT OR Apache-2.0"
+license = "MIT"
 categories = ["web-programming", "database"]
 edition = "2021"
 exclude = [ ".github", ".gitattributes", "target" ]

LICENSE.md

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024 Tembo
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -5,6 +5,124 @@ JSON Schema Postgres Extension
 [![Build Status](https://github.com/theory/pg-jsonschema/workflows/CI/badge.svg)](https://github.com/theory/pg-jsonschema/actions)
 
 This library provides the `jsonschema` extension for validating JSON and JSONB
-against a [JSON Schema] in Postgres.
+against a [JSON Schema] in Postgres. It supports the following [specification
+drafts] as validated by the [JSON-Schema-Test-Suite] excluding optional
+features:
+
+*   [![draft 4 badge]][draft 4 report]
+*   [![draft 6 badge]][draft 6 report]
+*   [![draft 7 badge]][draft 7 report]
+*   [![draft 2019-09 badge]][draft 2019-09 report]
+*   [![draft 2020-12 badge]][draft 2020-12 report]
+
+Installation
+------------
+
+The jsonschema extension is written in [Rust], using the [boon] JSON Schema
+validation library, and requires the Rust toolchain and [pgrx] to build. The
+simplest way to install Rust is [rustup]:
+
+``` sh
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+```
+
+Then use `cargo` to install `pgrx`:
+
+```sh
+cargo install --locked cargo-pgrx --version 0.11.3
+```
+
+Now build jsonschema against a working PostgreSQL server (including
+development libraries and the [pg_config] utility). Here's an example
+using PostgreSQL 15:
+
+``` sh
+cargo pgrx init --pg15="$(which pg_config)"
+```
+
+Adjust the `--pg15` option to your PostgreSQL version. Then build and install
+`jsonschema`:
+
+```sh
+cargo pgrx install --release
+```
+
+Once jsonschema is installed, you can add it to a database. Simply connect to
+a database as a super user and run the [CREATE EXTENSION] command:
+
+``` postgres
+CREATE EXTENSION jsonschema;
+```
+
+If you want to install jsonschema into a specific schema, `WITH SCHEMA`:
+
+``` postgres
+CREATE EXTENSION jsonschema WITH SCHEMA extensions;
+```
+
+See [the documentation](./doc/jsonschema.md) for usage details and features.
+
+Dependencies
+------------
+
+The `jsonschema` data type has no run-time dependencies other than PostgreSQL.
+At build time it requires [Rust] and [pgrx].
+
+Prior Art
+---------
+
+*   [postgres-json-schema]: JSON Schema Postgres extension written with pgrx +
+    jsonschema
+*   [postgres-json-schema]: JSON Schema Postgres extension written in PL/pgSQL
+*   [is_jsonb_valid]: JSON Schema Postgres extension written in C
+*   [pgx_json_schema]: JSON Schema Postgres extension written with pgrx +
+    jsonschema
+
+Copyright and License
+---------------------
+
+Copyright (c) 2024 Tembo
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
 
   [JSON Schema]: https://json-schema.org
+  [specification drafts]: https://json-schema.org/specification
+  [JSON-Schema-Test-Suite]: https://github.com/json-schema-org/JSON-Schema-Test-Suite
+  [draft 4 badge]: https://img.shields.io/endpoint?url=https://bowtie.report/badges/rust-boon/compliance/draft4.json
+  [draft 4 report]: https://bowtie.report/#/dialects/draft4 "boon draft 4 report"
+  [draft 6 badge]: https://img.shields.io/endpoint?url=https://bowtie.report/badges/rust-boon/compliance/draft6.json
+  [draft 6 report]: https://bowtie.report/#/dialects/draft6 "boon draft 6 report"
+  [draft 7 badge]: https://img.shields.io/endpoint?url=https://bowtie.report/badges/rust-boon/compliance/draft7.json
+  [draft 7 report]: https://bowtie.report/#/dialects/draft7 "boon draft 7 report"
+  [draft 2019-09 badge]: https://img.shields.io/endpoint?url=https://bowtie.report/badges/rust-boon/compliance/draft2019-09.json
+  [draft 2019-09 report]: https://bowtie.report/#/dialects/draft2019-09 "boon draft 2019-09 report"
+  [draft 2020-12 badge]: https://img.shields.io/endpoint?url=https://bowtie.report/badges/rust-boon/compliance/draft2020-12.json
+  [draft 2020-12 report]: https://bowtie.report/#/dialects/draft2020-12 "boon draft 2020-12 report"
+  [boon]: https://github.com/santhosh-tekuri/boon/ "boon: JSONSchema (draft 2020-12, draft 2019-09, draft-7, draft-6, draft-4) Validation in Rust"
+  [pgrx]: https://github.com/pgcentralfoundation/pgrx "pgrx: Build Postgres Extensions with Rust!"
+  [PostgreSQL]: https://postgresql.org "PostgreSQL: The World's Most Advanced Open Source Relational Database"
+  [rustup]: https://rustup.rs "rustup is an installer for Rust"
+  [Rust]: https://www.rust-lang.org/ "Rust: A language empowering everyone to build reliable and efficient software"
+  [pg_config]: https://www.postgresql.org/docs/current/app-pgconfig.html "PostgreSQL Docs: pg_config"
+  [CREATE EXTENSION]: https://www.postgresql.org/docs/current/sql-createextension.html
+    "PostgreSQL Docs: CREATE EXTENSION"
+  [pg_jsonschema]: https://github.com/supabase/pg_jsonschema
+  [postgres-json-schema]: https://github.com/gavinwahl/postgres-json-schema
+  [is_jsonb_valid]: https://github.com/furstenheim/is_jsonb_valid
+  [pgx_json_schema]: https://github.com/jefbarn/pgx_json_schema