README: Link to OAuth provider documenation
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With this plugin Gerrit can use OAuth2 protocol for authentication.
Supported OAuth providers:
-* Bitbucket
-* GitHub
-* Google
+* [Bitbucket](https://confluence.atlassian.com/bitbucket/oauth-on-bitbucket-cloud-238027431.html)
* [CAS](https://www.apereo.org/projects/cas)
+* [GitHub](https://developer.github.com/v3/oauth/)
+* [Google](https://developers.google.com/identity/protocols/OAuth2)
See the [Wiki](https://github.com/davido/gerrit-oauth-provider/wiki) what it can do for you.