Create Javascript tests

cadence/lib/js/.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = tab
+insert_final_newline = false
+max_line_length = 120
+tab_width = 2

cadence/lib/js/README.md

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+# Kitty Items Test Suit
+Tests here were created with [JS Testing Framework](https://github.com/onflow/flow-js-testing).
+If you ever get stuck, follow the link to find documentation and examples on how to use said framework.

cadence/lib/js/babel.config.json

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+{
+  "presets": [
+    [
+      "@babel/preset-env",
+      {
+        "targets": {
+          "node": "current"
+        }
+      }
+    ]
+  ]
+}

cadence/lib/js/flow.json

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+{
+	"emulators": {
+		"default": {
+			"port": 3569,
+			"serviceAccount": "emulator-account"
+		}
+	},
+	"contracts": {},
+	"networks": {
+		"emulator": "127.0.0.1:3569",
+		"mainnet": "access.mainnet.nodes.onflow.org:9000",
+		"testnet": "access.devnet.nodes.onflow.org:9000"
+	},
+	"accounts": {
+		"emulator-account": {
+			"address": "f8d6e0586b0a20c7",
+			"keys": "8e3983030d2af1fa01c078241ad7f699d492e0239247f38d5a96cb959e436531"
+		}
+	},
+	"deployments": {}
+}

cadence/lib/js/jest.config.js

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+module.exports = {
+    testEnvironment: "node",
+    verbose: true,
+    coveragePathIgnorePatterns: ["/node_modules/"],
+};