Adding more CloudLaunch CLI documentation

* CloudLaunch CLI obtained from following QuickStart/README.md
* Python 3.8.5
* macOS Catalina 10.15.7

### Description
I get errors using `cloudlaunch deployments create` and can't find docs to help me out (see below).

### Background
I love the ease and utility of using CloudLaunch through the web interface and would like to learn more about using the CLI. The quick start guide worked as advertised and I can list my deployments with

```
cloudlaunch deployments list
```

and I see there is a `create` option but I don't see any documentation for that beyond what I can get with the `--help` flag.

```
cloudlaunch deployments create [OPTIONS] NAME APPLICATION CLOUD
```

Trying the cmd from the quickstart page and the README.md here yields an error for me (see below). I guess I am missing some "required parameters" like `id` and I have tried a few variants but would benefit from some documentation and/or guidance. Thanks!

```
> cloudlaunch deployments create my-ubuntu-test ubuntu amazon-us-east-n-virginia --application-version 16.04
Traceback (most recent call last):
File "/Users/barry/tmpwork/gvl-cmdlaunch/venv/bin/cloudlaunch", line 8, in
sys.exit(client())
File "/Users/barry/tmpwork/gvl-cmdlaunch/venv/lib/python3.8/site-packages/click/core.py", line 829, in __call__
return self.main(*args, **kwargs)
File "/Users/barry/tmpwork/gvl-cmdlaunch/venv/lib/python3.8/site-packages/click/core.py", line 782, in main
rv = self.invoke(ctx)
File "/Users/barry/tmpwork/gvl-cmdlaunch/venv/lib/python3.8/site-packages/click/core.py", line 1259, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/Users/barry/tmpwork/gvl-cmdlaunch/venv/lib/python3.8/site-packages/click/core.py", line 1259, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/Users/barry/tmpwork/gvl-cmdlaunch/venv/lib/python3.8/site-packages/click/core.py", line 1066, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/Users/barry/tmpwork/gvl-cmdlaunch/venv/lib/python3.8/site-packages/click/core.py", line 610, in invoke
return callback(*args, **kwargs)
File "/Users/barry/tmpwork/gvl-cmdlaunch/venv/lib/python3.8/site-packages/cloudlaunch_cli/main.py", line 103, in create_deployment
cloudlaunch_client = create_api_client(cloud)
File "/Users/barry/tmpwork/gvl-cmdlaunch/venv/lib/python3.8/site-packages/cloudlaunch_cli/main.py", line 20, in create_api_client
cloud_resource = cloudlaunch_client.infrastructure.clouds.get(cloud)
File "/Users/barry/tmpwork/gvl-cmdlaunch/venv/lib/python3.8/site-packages/cloudlaunch_cli/api/endpoints.py", line 96, in get
item = self._client.action(document, self.path + ['read'],
File "/Users/barry/tmpwork/gvl-cmdlaunch/venv/lib/python3.8/site-packages/coreapi/client.py", line 160, in action
_validate_parameters(link, params)
File "/Users/barry/tmpwork/gvl-cmdlaunch/venv/lib/python3.8/site-packages/coreapi/client.py", line 80, in _validate_parameters
raise exceptions.ParameterError(errors)
coreapi.exceptions.ParameterError: {'id': 'This parameter is required.', 'slug': 'Unknown parameter.'}
```