change README

Author: River

README.md

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+This is an example of "How to use QPython in my android development?"
+http://qpython.org/question/18/how-to-use-qpython-in-my-android-development/
+
+The steps are:
+1) Prepare the Python script, use the "print" statement to output the result
+2) Use the "startActivityForResult" to call the QPython API with the Python code as the parameter
+3) Get and process the result in "onActivityResult"
+
+If you have any question, please ask in http://qpython.org