Update README.md

Added Pin mapping section

README.md

@@ -6,6 +6,35 @@ This is an Arduino library for communicating with ROBO Pro software over USB.
 
 The fx1-arduino-parser is a component that may be useful for a variety of projects, including educational tools. I want developers to be able to play with fx1-arduino-parser, give feedback, and think of novel uses for it. All the code is free and open source. Enjoy!
 
+##Pin mapping
+
+Inputs
+
+| RP pin        | Arduino pin | RP pin mode |
+|:------------- |:-----------:|:-----------:|
+| I1            | 2           | Digital     |
+| I2            | 3           | Digital     |
+| I3            | 4           | Digital     |
+| I4            | A0          | Analog      |
+| I5            | A1          | Analog      |
+| I6            | A2          | Analog      |
+| I7            | -           | -           |
+| I8            | -           | -           |
+
+
+Оutputs
+
+| RP pin        | Arduino pin | RP pin mode  |
+|:------------- |:-----------:|:------------:|
+| O1            | 8           | Digital      |
+| O2            | 9           | Analog (0-8) |
+| O3            | 10          | Analog (0-8) |
+| O4            | 11          | Analog (0-8) |
+| O5            | 12          | Digital      |
+| O6            | 13          | Digital      |
+| O7            | -           | -            |
+| O8            | -           | -            |
+
 ##Version history:
 V0.1 - 03.01.2013. This version tested with ROBO Pro 3.2.0, Arduino IDE 1.0.3 and ARUDINO UNO R3 board.