[skip ci] Update readme

README.md

@@ -36,7 +36,6 @@ function Example(){
 
 **Note**: the providers list has no particular sorting order and is shuffled at every page load.
 
-
 #### Accessibility notes
 
 In general using the `POST` version of this component makes it usable for the most wide audience, as the `GET` version uses links which may have issues. To know more read below.
@@ -45,6 +44,30 @@ The component tries its best to provide the best a11y practices implemented, but
 In particular in OSX Safari and Firefox have some issues with `focus` and the behaviour of `tab`: [please read about it](https://github.com/theKashey/react-focus-lock#focusing-in-osx-safarifirefox-is-strange) when using this component.
 
 
+#### Contributing
+
+To get up and running with the development of the project you can follow these steps.
+
+To see the component in action, useful to test it manually after some changes, open a terminal window and type:
+
+```sh
+cd example
+npm start
+```
+
+This will start the `create-react-app` project and open a new browser tab with the example application in it.
+
+At this point it is possible to perform changes to the component/library, open a new terminal in the project folder and use this command when done with changes:
+```sh
+npm build
+```
+
+To run the test do:
+
+```sh
+npm test
+```
+
 # API