Add README to example project

Author: devxoul

Example/README.md

@@ -0,0 +1,16 @@
+# RxKeyboardExample
+
+This is an example messenger application using RxKeyboard.
+
+![rxkeyboard-example](https://cloud.githubusercontent.com/assets/931655/22062707/625eea7a-ddbe-11e6-9984-529abae1bd1a.gif)
+
+## Building Project
+
+1. Install CocoaPods libraries.
+
+    ```console
+    $ pod install
+    ```
+
+2. Open **`RxKeyboardExample.xcworkspace`** file.
+3. Press <kbd>⌘</kbd> + <kbd>R</kbd> to build and run the project.