Merge pull request #4177 from shaedrich/oauth2

Create topic "OAuth 2.0"

topics/oauth2/index.md

@@ -0,0 +1,21 @@
+---
+aliases: rfc-6749, rfc6749
+topic: oauth2
+display_name: OAuth 2.0
+short_description: OAuth 2.0 is the industry-standard protocol for authorization.
+created_by: IETF OAuth Working Group
+released: October 2012
+related: oauth, authentication, openid, oidc, saml, raml, xacml, indieauth, access-token, refresh-token
+url: https://oauth.net/2/
+wikipedia_url: https://en.wikipedia.org/wiki/OAuth#OAuth_2.0
+logo: oauth2.png
+---
+**OAuth 2.0** (short for "**Open Authorization**") is the industry-standard protocol for authorization. Generally, the OAuth protocol provides a way for resource owners to provide a client [application] with secure delegated access to server resources.
+
+# Types
+OAuth framework specifies several grant types for different use cases. Some of the most common OAuth grant types are:
+* Authorization Code
+* PKCE
+* Client Credentials
+* Device Code
+* Refresh Token