Update README.md

Author: wdhdev

README.md

@@ -1,2 +1,38 @@
-# is-a-dev-cli
+# is-a.dev CLI
 Register your own is-a.dev subdomain from your command line!
+
+## Getting Started
+
+Using the is-a.dev CLI is easy!
+
+All you need to do is run the following command:
+
+```bash
+npm install @is-a-dev/cli -g
+```
+
+...and that's it!
+
+## Using Commands
+
+All of the CLI commands start with `is-a-dev`.
+
+To show the help menu, in your terminal run this command:
+
+```bash
+is-a-dev help
+```
+
+### Debugging
+
+If you are having issues using the CLI, follow these simple steps:
+
+1. Run the debug command
+
+```bash
+is-a-dev debug
+```
+
+2. Open an issue
+
+Open an issue stating your issue and provide the output from the debug command as well.