Add initial tests

.github/workflows/test.yml

@@ -0,0 +1,51 @@
+name: Test
+on: [push, pull_request]
+jobs:
+  test_18:
+    name: Test node.js 18
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install node.js v18
+        uses: actions/setup-node@v4
+        with:
+          node-version: 18
+          cache: npm
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Run tsc
+        run: npm run prestart
+
+      - name: Run eslint
+        run: npm run lint
+
+      - name: Run tests
+        run: npm run test
+  test_20:
+    name: Test node.js 20
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install node.js v20
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Run tsc
+        run: npm run prestart
+
+      - name: Run eslint
+        run: npm run lint
+
+      - name: Run tests
+        run: npm run test

README.md

@@ -8,7 +8,7 @@ Typescript library for the V2 [Patreon API](https://docs.patreon.com/)
 
 ## Installation
 
-> **Warning**
+> [!WARNING]
 > You might be looking for [patreon-js](https://github.com/Patreon/patreon-js) for JavaScript, [patreon-api-types](https://github.com/mrTomatolegit/patreon-api-types) for less strict types and no client or another package in between.
 
 ```sh
@@ -17,7 +17,7 @@ npm install patreon-api.ts
 
 ## Usage
 
-> **Warning**
+> [!NOTE]
 > This package does not include v1 of the Patreon API and starts with [API v2](https://docs.patreon.com/#apiv2-oauth)
 
 The default API version for this package is `2` and might change in major versions.