Update README.md

README.md

@@ -1,13 +1,26 @@
 # Pando Protocol
+Pando protocol makes communication between different machines easy and universal .
 
-## Introduction
-Pando binary protocol for iot devices with C implementation.   
-This protocol used to transform information between sever and iot devices, costs resource as little as possible.   
+## Introduction  
+Pando protol does't provide a method to ensure communication reliability, other protocol such as MQTT has already achive the target. 
+Pando protocol transforms information in binary form, because binary packet costs less net resource.   
+This git project only provides documents define how to organize information into binary without concrete code implimentation.  
+There is a C implimentation in [pando-embedded-framework](https://github.com/PandoCloud/pando-embedded-framework), this will show you how to use pando protocol above mqtt protocol.  
+You can transplant pando protocol to other laguage, the detail of pando protocol is in the design chapter.  
 
-## Usage
-What to do with these APIs. 
+## Why use pando protocol    
+Pando cloud is an open source technological package, everyone can set up a whole iot system from cloud server, net access device and embeded devices.  
+Pando protocol can communicate in a unified way between different systems builded up by developers.  
+
+
+## How to start  
+This chapter shows you to start with pando protol in [pando-embedded-framework](https://github.com/PandoCloud/pando-embedded-framework).   
+Pando embedded framework has transplanted to wifi chipset esp8266, you need to do these steps to run pando protol.
+1. TODO 1  
+2. TODO 2  
+3. TODO 3
 
 ## Design
-How to orgnize data into package, and why.   
+This chapter shows the details about pando protocol.   
 [中文设计文档](https://github.com/PandoCloud/pando-protocol/wiki/Chinese-documents)  
 [English Design Documents](https://github.com/PandoCloud/pando-protocol/wiki/English-documents)