Update README.md

README.md

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