feat: add js embedding example

internal/js/example/.gitignore

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+node_modules
+.DS_Store
+.vscode
+.idea

internal/js/example/README.md

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+# Gnopls Embedding Example
+
+This directory contains a bare-minimum code to integrate Gnopls as a WebAssembly module
+into browser or Node.js environment.
+
+This example omits such nuances as editor integration or file system support and focuses just on basics.
+
+## Prerequisites
+
+* Copy `wasm_exec.js` file using following command:
+    * `cp $(go env GOROOT)/misc/wasm/wasm_exec.js .`
+* Build gnopls as a WebAssembly file for JavaScript environment:
+    * `GOOS=js GOARCH=wasm make build`
+* Modify paths to `wasm_exec.js` and WASM file in [worker.ts](./worker.ts) file.

internal/js/example/package.json

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+{
+  "name": "example",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "@types/golang-wasm-exec": "^1.15.2",
+    "comlink": "^4.4.1",
+    "monaco-languageclient": "^8.7.0",
+    "vscode-languageclient": "^9.0.1",
+    "vscode-languageserver-protocol": "^3.17.5"
+  }
+}