Update README.md

Author: pchab

README.md

@@ -15,7 +15,17 @@ If you want to use them in your project, I recommend working with IntelliJ IDEA
 
 - Start a new android application project
 - Add the .jar and .so in the libs folder
-- Right-click "add as library"
+- Right-click "add as library" 
+
+## How To
+
+You need [ProjectRTC](https://github.com/pchab/ProjectRTC) up and running, and it must be somewhere that your android can access. (You can quickly test this with your android browser).
+
+When you launch the app, you will be given several options to send a message : "Call someone"
+Use this menu to send the link to your stream. This link can be opened with a WebRTC-capable browser or by another AndroidRTC.
+The video call should then start.
+
+Your stream should appear as "android_test" in ProjectRTC, so you can also use the call feature there.
 
 ## Author