add readme

Author: nirav24

README.md

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+# Gituser
+
+Gituser is a CLI to easily manage/switch git users.
+
+## Install
+
+### Using go
+
+run following command to download latest gituser cli using `go`
+
+```sh
+go install github.com/nirav24/gituser@latest
+```
+
+### using github assests
+
+Download approparite assest file from latest release, unzip the file and put binary into appropriate path (e.g. `/usr/local/bin`)