Update README.md

Author: alvaromb

README.md

@@ -1,2 +1,6 @@
 # react-native-floating-label
-A collection of useful tcomb-form-native factories
+A floating label factory to use with ``tcomb-form-native`` library.
+
+<p align="center">
+<img src="https://raw.githubusercontent.com/wiki/alvaromb/react-native-floating-label/floating-form.gif" alt="Floating label" width="400">
+</p>