chore(repo): add readme

README.md

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+# git-su
+switch between git users.
+
+is this original? not at all. this is my own take on it because i wanted my own syntax for the cli.
+
+## usage
+note: git allows running commands formatted in `git-*` as `git *`, so you can also run this as `git su`.
+```
+Usage: git-su <COMMAND>
+
+Commands:
+  list     list all profiles
+  use      use a profile
+  add      add a profile
+  remove   remove a profile
+  current  show current git user
+  help     Print this message or the help of the given subcommand(s)
+
+Options:
+  -h, --help     Print help
+  -V, --version  Print version
+```
+
+## installation
+
+there is currently no automated installation. simply build the program and place the resulting executable in your path.
+
+## building
+
+build using `just`. see available recipes by running `just` or `just --list`.