Update README.md

README.md

 
 ### Test and Development
 
-TODO
+Check our [development guide](https://github.com/wkh237/react-native-fetch-blob/wiki/Development-Guide)
 
 ### TODO
 
+V0.5 [milestone](https://github.com/wkh237/react-native-fetch-blob/milestones/v0.5)
+
 * Save file to storage directly
 * Custom MIME type in form data
 * Upload/Download progress report