Add webex-teams-sso-samples

[dstaudt]

https://github.com/CiscoDevNet/webex-teams-sso-samples

webex-teams-sso-samples

Server-side (Node.JS) and client-side sample apps demonstrating OAuth2 with Webex REST APIs

Included samples:

• browser_sdk - Use the Webex Teams Browser SDK and the implicit grant type to authenticate in a single-page app

• oauth_client - Use Node/JavaScript primitives to authenticate using the authorization code grant type in a single-page app

• server_side - Authenticate using the authorization grant type on the server side

• widget - Authenticate a user server-side, then launch a Space Widget embedded in a web page to collaborate with a target Webex Teams user

• refresh - Demonstrate using a refresh token to renew an access token

• logout - Demonstrate logging a user out / invalidating an access token