Add JavaScript example

example/javascript/README.md

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+#### Requirements
+
+- node.js v9.0.0+
+- libtdjson binary
+
+#### Run
+
+```console
+$ npm install
+$ node example.js
+```

example/javascript/example.js

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+const ffi = require('ffi-napi')
+const ref = require('ref-napi')
+
+function buildQuery (query) {
+  const buffer = Buffer.from(JSON.stringify(query) + '\0', 'utf-8')
+  buffer.type = ref.types.CString
+  return buffer
+}
+
+const PATH_TO_LIBRARY_FILE = 'libtdjson'
+
+const tdlib = ffi.Library(
+  PATH_TO_LIBRARY_FILE,
+  {
+    'td_json_client_create'          : ['pointer', []],
+    'td_json_client_send'            : ['void'   , ['pointer', 'string']],
+    'td_json_client_receive'         : ['string' , ['pointer', 'double']],
+    'td_json_client_execute'         : ['string' , ['pointer', 'string']],
+    'td_json_client_destroy'         : ['void'   , ['pointer']],
+    'td_set_log_file_path'           : ['int'    , ['string']],
+    'td_set_log_verbosity_level'     : ['void'   , ['int']],
+    'td_set_log_fatal_error_callback': ['void'   , ['pointer']]
+  }
+)
+
+// Create client
+const client = tdlib.td_json_client_create()
+
+function send (query) {
+  tdlib.td_json_client_send(client, buildQuery(query))
+}
+
+function execute (query) {
+  return JSON.parse(
+    tdlib.td_json_client_execute(client, buildQuery(query))
+  )
+}
+
+function receive () {
+  const timeout = 2
+  return JSON.parse(
+    tdlib.td_json_client_receive(client, timeout)
+  )
+}
+
+function destroy () {
+  tdlib.td_json_client_destroy(client)
+}
+
+// Testing execute
+console.log('execute', execute({
+  '@type': 'getTextEntities',
+  'text': '@telegram /test_command https://telegram.org telegram.me'
+}))
+
+// Testing send
+send({ '@type': 'getAuthorizationState' })
+
+// Testing receive
+console.log('receive', receive())
+
+// Destroy client
+destroy()

example/javascript/package.json

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+{
+  "name": "tdlib-js-example",
+  "version": "1.0.0",
+  "description": "",
+  "private": true,
+  "main": "example.js",
+  "scripts": {
+    "start": "node example.js"
+  },
+  "engines": {
+    "node": ">= 9.0.0"
+  },
+  "dependencies": {
+    "ffi-napi": "^2.4.3",
+    "ref-napi": "^1.4.0"
+  }
+}