fix(README): add help to launch

Author: koromerzhin

README.md

@@ -36,12 +36,22 @@ git clone --recurse-submodules git@github.com:hackariens/socketio.git socketio
 cd socketio
 ```
 
+## Environnment
+
+Edit .env with .env.example
+
 ## Install
 
 ```sh
 npm install
 ```
 
+## Launch
+
+``` sh
+npm run exec
+```
+
 ## Author
 
 👤 **koromerzhin**