add README

README

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+Pi is a Chinese device. 
+We want port Openmoko to Pi, All free software
+
+1. open the case
+2. take off the cover of PCB
+   then you will send the "GND" and "TXD"
+   you can get serial output from those pins 
+
+3. you need a "RS-232 <--> TTL" converter to 
+   get the correct output date
+