OAuth 2.0 support #27
Description
Is your feature request related to a problem? Please describe.
Chess.com's api now support OAuth 2.0 authorization, per https://www.chess.com/announcements/view/chess-com-oauth-login-application
Describe the solution you'd like
Allow support for OAuth 2.0 in the API wrapper, as documented in https://chesscom.notion.site/Getting-started-with-Chess-com-OAuth-2-0-Server-5958e57c8c934a3aa7abda2d670969e8