Initial CLI tool page

CLI-Tool.md

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+You can use the mango CLI tool to perform management tasks. 
+
+## `admin`
+
+### `user`
+Using this subcommand, you can perform user administration from the command line. Below is a short list of example commands
+
+```bash
+# list the users
+mango admin user list
+
+# create a new user with admin access
+mango admin user add -u new_user -p 123456 --admin
+
+# rename the user
+mango admin user update new_user -u new_name --admin
+
+# remove admin access
+mango admin user update new_name
+
+# delete the user
+mango admin user delete new_name
+```