update README

/reviewed-on !11

README

-What is RenderJs?
+# RenderJS
 
-  A JavaScript library which helps modularizing your HTML5 code and your JavaScript for Browser.
+RenderJS is a promised-based JavaScript library for developing modularized single page web applications. It uses HTML5 to specify self-contained components consisting of HTML5, CSS and Javascript (called "gadgets"). Gadgets are reusable in different applications just as easily as linking an HTML5 page to another and can combined to build complex applications.
 
-Documentation
+### RenderJS Documentation
 
-  Documentation is available at http://www.renderjs.org/
+The documentation can be found on [https://renderjs.nexedi.com](https://renderjs.nexedi.com)
 
-Developer
+### RenderJS Quickstart
+    git clone https://lab.nexedi.com/nexedi/renderjs.git
+    npm install
+    grunt server
 
-  > git clone http://git.erp5.org/repos/renderjs.git
 
-  > npm install
+### RenderJS Code
 
-  > grunt server
+RenderJS source code is hosted on Gitlab at [https://lab.nexedi.com/nexedi/renderjs/](https://lab.nexedi.com/nexedi/renderjs) (Github [mirror](https://github.com/nexedi/renderjs/) - please use the issue tracker on Gitlab)
+
+### RenderJS Test
+You can run tests after installing and building RenderJS by opening the */test/* folder