text: Title: Add examples for authentication (Basic, OAuth, etc.)
  Body: We need examples of how to perform authentication with Uplink. This includes:
  - [ ] [Basic Authentication](https://uplink.readthedocs.io/en/stable/user/auth.html#basic-authentication)
  - [ ] [OAuth with `requests-oauthlib`](https://uplink.readthedocs.io/en/stable/user/auth.html#using-auth-support-for-requests-and-aiohttp)
  - [ ] [Using other third-party Auth Support for Requests and aiohttp](https://uplink.readthedocs.io/en/stable/user/auth.html#using-auth-support-for-requests-and-aiohttp)
  - [ ] [Using the `Query` or `Header` annotations](https://uplink.readthedocs.io/en/stable/user/auth.html#other-authentication)
  - [ ] [Setting authentication tokens with the `session` property](https://uplink.readthedocs.io/en/stable/user/auth.html#other-authentication)
  
  These examples should reside under the [`examples`](https://github.com/prkumar/uplink/tree/master/examples) directory.
  