Add readme for python wrapper

- Add readme for python wrapper
- Add link to main page of documentation for python.

RF24.h

@@ -1210,6 +1210,7 @@ private:
  * See the included examples for more info on using ATTiny with RF24 <br>
  * See https://github.com/TCWORLD/ATTinyCore/tree/master/PCREL%20Patch%20for%20GCC for ATTiny patch
  * - Raspberry Pi Support: See the readme at https://github.com/TMRh20/RF24/tree/master/RPi/RF24
+ * - A python wrapper is also available for RPi: https://github.com/TMRh20/RF24/tree/Updates/RPi/pyRF24/readme.md
  *
  * @section More More Information
  *

RPi/pyRF24/readme.md

+# RF24 Python Wrapper (by https://github.com/mz-fuzzy)  
+  
+Installation:  
+  
+1. Install the boost libraries:  
+    sudo apt-get install libboost1.50-all
+2. Build the library:  
+    ./setup.py build
+3. Install the library:install:  
+    ./setup.py install
+	
+
+See the included example for usage information. ( https://github.com/TMRh20/RF24/tree/master/examples_RPi )
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