basic CLI instructions

README.md

@@ -196,6 +196,16 @@ array (
 )
 ```
 
+## Command Line Interface
+
+With just an API key and a Collection ID, you can perform requests to the API from the command line. Assuming you've cloned the repo and run `composer install`, you can run the following from the repo root:
+
+```
+bin/gearlab
+```
+
+This will display help text for all available subcommands of the CLI. You can also get help for any subcommand by running `bin/gearlab help <cmd>` or `bin/gearlab <cmd> -h`.
+
 ## Architecture
 
 This package incorporates PHP code that is automatically generated by the [Swagger Codegen](https://github.com/swagger-api/swagger-codegen) project from the [GearLab Tool API Spec](https://app.swaggerhub.com/apis-docs/ctamayo/gearlab-tools/v2). The generated code is exported automatically when the spec is saved in Swagger Hub, and is contained entirely in the `swagger/SwaggerClient-php` directory within this repo. The Composer autoloader is configured to autoload this code: