[Google Assistant] Install the SDK and Sample Code

reference
- https://developers.google.com/assistant/sdk/guides/service/python/embed/install-sample

$ sudo apt-get update
$ sudo apt-get install python3-dev python3-venv

$ python3 -m venv env

$ env/bin/python -m pip install --upgrade pip setuptools wheel

$ source env/bin/activate

(env) $ sudo apt-get install portaudio19-dev libffi-dev libssl-dev

(env) $ python -m pip install --upgrade google-assistant-sdk[samples]

(env) $ python -m pip install --upgrade google-auth-oauthlib[tool]
(env) $ google-oauthlib-tool --scope https://www.googleapis.com/auth/assistant-sdk-prototype --save --headless --client-secrets /path/to/client_secret_client-id.json


// voice input
(env) $ googlesamples-assistant-pushtotalk --project-id xxx --device-model-id yyy

// text input
(env) $ python -m googlesamples.assistant.grpc.textinput --device-id xxx --device-model-id yyy