Add doc

Author: shennongmin

README.md

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+@mainpage
+
+# WeeESP8266
+
+An ESP8266 library for Arduino providing an easy-to-use way to manipulate ESP8266.
+
+# Source 
+
+Source can be download at <https://github.com/itead/ITEADLIB_Arduino_WeeESP8266>.
+
+You can clone it by:
+
+    git clone https://github.com/itead/ITEADLIB_Arduino_WeeESP8266.git
+
+# Documentation
+
+Online API documentation can be reached at <http://docs.iteadstudio.com/ITEADLIB_Arduino_WeeESP8266/index.html>.
+
+Offline API documentation can be found under directory 
+[doc](https://github.com/itead/ITEADLIB_Arduino_WeeESP8266/tree/master/doc).
+
+# How to get started
+
+On the home page of API documentation, the tabs of Modules, Classes and Examples 
+will be useful for Arduino developers. 
+
+# Mainboard Requires
+
+  - RAM: not less than 2KBytes
+  - UART: one hardware serial at least 
+
+# Suppported Mainboards
+
+  - WBoard Pro
+  - MEGA and its derivatives
+
+-------------------------------------------------------------------------------
+
+# The End!
+
+-------------------------------------------------------------------------------