Add readme

Author: nicolanrizzo

README.md

@@ -1,2 +1,41 @@
 # node-microframework-cors
 Plugin to activate cors support
+
+## Installing
+
+To install and add the dependency to the package.json, run the following command:
+
+```
+npm install bap-node-microframework-cors --save
+```
+
+## Configuration
+
+To activate cors support with the default options (enable All CORS Requests), write the following code in app/app.ts:
+
+```javascript
+// app/app.ts
+...
+
+import { CorsPlugin } from 'bap-node-microframework-cors';
+
+...
+
+import { Kernel } from "./kernel";
+var kernel = new Kernel();
+var App = new Application(<ApplicationOptions>{
+    ...
+}, <KernelInterface>kernel);
+
+...
+
+App.registerPlugin(CorsPlugin, {});
+
+...
+
+App.start();
+
+...
+```
+
+You can read the full list of configuration options (here)[https://github.com/expressjs/cors#configuration-options] (at the moment, only origin and credentials are supported).