update README

Author: cypressious

README.md

@@ -1,9 +1,34 @@
 # Kotlin WebExtensions API Declarations Generator
 
-This project has the purpose of generating Kotlin JS declarations for the Firefox WebExtensions API from the offical schema files.
+This project contains Kotlin JS declarations for the Firefox WebExtensions API generated from the offical schema files.
+
+The schema is taken from https://github.com/mozilla/gecko-dev/tree/master/browser/components/extensions/schemas and https://github.com/mozilla/gecko-dev/tree/master/toolkit/components/extensions/schemas.
+
+## How to use in a Gradle project
+
+You can include the declarations in your project by using jitpack.io.
+
+In your `build.gradle` add
+
+```groovy
+repositories {
+    // ...
+    maven { url 'https://jitpack.io' }
+}
+```
+
+and
+
+```groovy 
+dependencies {
+    // ...
+    compile 'com.github.cypressious.kotlin-webextensions-declarations:webextensions-declarations:v0.1'
+}
+```
+
+## Example project
+
+See https://github.com/cypressious/second-firefox-extension-kotlin
 
-The schema is taken from https://github.com/mozilla/gecko-dev/tree/master/browser/components/extensions/schemas.
 
-## Status
 
-Work in Progress