chore: update README

README.md

@@ -3,18 +3,43 @@
 
 ## Requirements
 
+- Xcode 12.4+
+- Swift 5.3+
+- iOS 14.0+
+
 ## Setup
+We needs the latest version Xcode from App Store. And install Cocoapods for dependency management.
 
-### Setup for M1 Mac
+### CocoaPods
 
-CocoaPods may fail to update. Try install fii to fix it.
+#### For the Intel Mac
 
 ```zsh
-# https://github.com/CocoaPods/CocoaPods/issues/10220
+# install cocoapods from Homebrew
+brew install cocoapods
+pod install
+```
+
+#### For the M1 Mac
+
+```zsh
+# install cocoapods from Homebrew
+brew install cocoapods
+
+# pod install may not works on M1 Mac. Fix by install ffi
+# ref: https://github.com/CocoaPods/CocoaPods/issues/10220
 sudo arch -x86_64 gem install ffi
 
+arch -x86_64 pod install
 ```
 
+## Start
+
+1. Open `Mastodon.xcworkspace` 
+2. Wait the Swift Package Dependencies resolved. 
+2. Check the signing settings make sure choose a team. [More info…](https://help.apple.com/xcode/mac/current/#/dev23aab79b4)
+3. Select `Mastodon` scheme and run it.
+
 
 ## Acknowledgements