chore: Add CLI.md

Author: QuiiBz

CONTRIBUTING.md

@@ -1,5 +1,6 @@
 ## Contributing
 First, make sure you have Yarn installed on your system.
+For information about the CLI, head over to [CLI.md](cli/CLI.md)
 
 You will need `windows-build-tools` to compile the project. Install it globally (as an administrator) with:
 - `yarn global add windows-build-tools`

cli/CLI.md

@@ -0,0 +1,15 @@
+## Developing the CLI
+First, make sure you have Yarn installed on your system.
+
+Then:
+1) Install JS dependencies with:
+- `yarn`
+2) Start the compilation:
+- `yarn watch`
+3) Run the CLI to test it:
+- `yarn start`
+
+You can add any arguments and options: `yarn start --version`.
+
+### Building
+To build the CLI, run `yarn dist`. The compiled file is located at `resources/cli/cli.js`