Specmatic

Updated documentation to provide a brief overview of all the main api methods.

Improvements to running asgi apps in tests.

Fixed bugs which occurred when running all tests together which have ASGI apps.
ASGI apps will be run in a separate process.

- Removed mandatory from project_root param.
Either of project_root, contract_file_path, or specmatic_json_file_path needs to be supplied

- Added support for running ASGI apps like Sanic.
- Modified the app_server creation api to make it consistent with the stub.

- Made stub_host and stub_port optional.
- Specmatic stub will run on whatever port is determined by the java package ( which is 9000 by default)
- If app_host, app_port are not supplied, the app will be run on a random freely available port.
- Added tests to illustrate explicit and implicit port settings.
- Changed the api to make it consistent with the agreed upon spec.