write some more doc

docs/examples/1.md

@@ -44,3 +44,9 @@ class HelloGL extends React.Component {
   }
 }
 ```
+
+A GL component is implemented in 2 parts:
+
+- first, you need to implement a fragment shader in GLSL (OpenGL Shading Language).
+Give it to `GL.Shaders.create` and you have a backed object in return (like `StyleSheet.create`).
+- second, you can render a `<GL.View>` and pass-in the shader you have defined previously. **Do not forget to give a width and height**.

docs/examples/2.md

@@ -49,3 +49,8 @@ class Saturation extends React.Component {
   }
 }
 ```
+
+GL.View supports `uniforms` props that allow to send to the shader any parameters from the JavaScript world.
+
+In this example, we send the `factor` number (that come from props) and we also send the image.
+The image have the same format as the `source` passed in an `<Image/>`.