Update README.MD

First readme version

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-Node pool contains two <a href="https://nodejs.org/api/worker_threads.html#worker_threads_worker_threads">worker-threads </a> pool implementations. <br>
+Node pool contains two <a href="https://nodejs.org/api/worker_threads.html#worker_threads_worker_threads">worker-threads </a> pool implementations , you don' t have to deal with worker-threads complexity. <br>
 The first implementation is a static thread pool , with a defined number of threads that are started at creation time .<br>
 The second implementation is a dynamic thread pool with a number of threads started at creation time and other threads created when the load will increase ( with an upper limit ). <br>
 
+## Installation
+```
+npm install node-pool --save
+```
+# Usage
+
+You can implement a worker in a simple way , extending the class ThreadWorker : 
+
+```js
+'use strict'
+const { ThreadWorker } = require('node-pool')
+
+class MyWorker extends ThreadWorker {
+  constructor () {
+    super((data) => {
+      // this will be executed in the worker thread, the data will be received by using the execute method
+      return { ok: 1 }
+    })
+  }
+}
+module.exports = new MyWorker()
+```
+
+Instantiate your pool based on your needed : 
+
+```js
+'use strict'
+const { FixedThreadPool  } = require('node-pool')
+
+// a fixed thread pool
+const pool = new FixedThreadPool(15,
+  './yourWorker.js')
+
+// or a dynamic thread pool
+const pool = new DynamicThreadPool(10, 100,
+  './yourWorker.js')
+pool.emitter.on('FullPool', () => console.log('Pool is full'))
+
+// the execute method signature is the same for both implementations,
+// so you can easy switch from one to another
+pool.execute({}).then(res => {
+  console.log(res)
+}).catch .... 
+
+```
+
+<strong> See examples folder for more details.
+
+## Node versions
+You can use node version  10.x  with --experimental-worker flag, or you can use 12.x version <br>
+
+## API
+
+TODO
+
+## License
+
+[MIT](https://github.com/pioardi/node-pool/blob/master/LICENSE)
+