[README] add readme

Author: KevinZonda

README.md

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+# fgit-go
+
+Command line to do git operation with FastGit.
+
+## What works
+
+- Clone  
+*git clone GITHUB_URL* command had been tested in Windows 10(build 1809)
+
+- Stdout/stderr  
+Real-time display has been tested in Windows 10(build 1809)
+
+## Preparation
+
+Before use fgit-go, install git by yourself. Add git to env PATH is also required.
+
+Download source code of fgit-go, build and run.
+
+## Difference between fgit
+
+[fgit](https://github.com/fastgitorg/fgit) by @xkeyc only provides clone operation support, but fgit-go provides push and etc.
+
+And, fgit-go is cross-platform.
+
+## How does fgit-go work
+
+To clone, fgit-go just replaces url to FastGit url.
+
+To push, fgit-go modifies .git config temporarily.