Update README.md

README.md

@@ -1,14 +1,43 @@
 # africa-states
 A list of municipalities in African countries.
 
+[![npm version](https://img.shields.io/npm/v/@stripe/react-stripe-js.svg?style=flat-square)](https://www.npmjs.com/package/@stripe/react-stripe-js)
+
 ## Installation
+First, install the package : 
+```sh
+  // using npm
+  npm install https://github.com/homescriptone/africa-states
+
+  or
+
+  // using yarn
+  yarn add https://github.com/homescriptone/africa-states
+```
 
 ## Usage
+```js
+  import StateManager from '@homescriptone/africa-states'
+
+  //Instantiate the StateManager
+  const state_obj = new StateManager();
+
+  //Get all states
+  let all_states = state_obj.get_all_states();
+
+  //Get state from a specific country
+  let benin_states = state_obj.get_state('BJ');
+  let togo_states  = state_obj.get_state('TG'); 
+  ...
+
+```
 
 ## Contributing
 Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.
 
+Feel free to add states of your country by following the format already defined.
+
 Please make sure to update tests as appropriate.
 
 ## License
-[Apache](http://www.apache.org/licenses/)
+[Apache](http://www.apache.org/licenses/)