urlshortener sample client

Steps to run:

1. Generate the OpenAPI 3.0 description using disco (in the gnostic/apps directory).

    disco get urlshortener --openapi3
   

2. (optional) View the JSON OpenAPI 3.0 description.

    gnostic openapi3-urlshortener-v1.pb --json-out=-
   

3. Generate the urlshortener client.

    gnostic openapi3-urlshortener-v1.pb --go-client-out=urlshortener
   

4. Build the client.

    go install 
   

5. Download client_secrets.json from the Google Cloud Developer Console.

6. Run the client

    urlshortener