Update README.md

sfragrance · Dec 4, 2017 · 1b37639 · 1b37639
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@@ -3,3 +3,18 @@ A tool to capture screenshot and recognize text by online ocr apis
 
 # Screenshot
 ![img](https://raw.githubusercontent.com/gragrance/CaptuocrToy/master/screenshot.gif)
+
+# How to build  
+1. You should install **Xcode Command Line Tools** and **cocoapod** first.
+    - ```xcode-select --install```
+    - ```sudo gem install -n /usr/local/bin cocoapods```  
+
+2. Clone repository
+    - ```git clone https://github.com/gragrance/CaptuocrToy.git```  
+
+3. Build
+```bash
+cd CaptuocrToy
+pod update
+BuildArea/autobuild.sh
+```