Update README

Author: kabirbaidhya

README.md

@@ -12,10 +12,19 @@ $ npm install
 # Or using yarn
 $ yarn
 ```
+Create a config `chill.yml` file using the sample file.
+```bash
+$ cp chill.yml.dist chill.yml
+```
+
+Run migrations
+```
+$ yarn migrate
+```
 
-Then start the app
+Then start the server by providing the config file path. If this is not provided, it will expect the file to be in the current directory.
 ```
-$ npm start
+$ CHILL_CONFIG=/path/to/chill.yml yarn start
 ```
 
 ## Contributing