Add OmniAuth Documentation

Add GitHub OmniAuth docs

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remove old doc

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Revert omniauth provider format

Add OmniAuth Documentation

Add GitHub OmniAuth docs

Google instructions

Google instructions

Merge master

Clean things up

Clean things up

Clean things up

Clean things up

Clean things up

Clean things up

Clean things up

Add Google and Twitter docs

Add screenshot

Add screenshot

Clean things up

Clean things up

Clean things up

Clean things up

Clean things up

Clean things up

Clean things up

Finalize current docs

Finalize current docs

Add existing user information

Add twitter

Add twitter

Add Twitter disclaimer

Add Twitter disclaimer

remove old doc

Remove unnecessary link

Revert omniauth provider format

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diff --git a/doc/integration/omniauth.md b/doc/integration/omniauth.md
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+# OmniAuth
+
+GitLab leverages OmniAuth to allow users to sign in using Twitter, GitHub, and other popular services. Configuring
+OmniAuth does not prevent standard GitLab authentication or LDAP (if configured) from continuing to work. Users can
+choose to sign in using any of the configured mechanisms.
+
++ [Initial OmniAuth Configuration](#initial-omniauth-configuration)
++ [Supported Providers](#supported-providers)
++ [Enable OmniAuth for an Existing User](#enable-omniauth-for-an-existing-user)
+
+### Initial OmniAuth Configuration
+
+Before configuring individual OmniAuth providers there are a few global settings that need to be verified.
+
+1. Open the configuration file<br />
+
+    ```sh
+    cd /home/git/gitlab
+
+    sudo -u git -H editor config/gitlab.yml
+    ```
+
+2. Find the section dealing with OmniAuth. The section will look similar to the following.<br />
+    ```
+      ## OmniAuth settings
+      omniauth:
+        # Allow login via Twitter, Google, etc. using OmniAuth providers
+        enabled: false
+
+        # CAUTION!
+        # This allows users to login without having a user account first (default: false).
+        # User accounts will be created automatically when authentication was successful.
+        allow_single_sign_on: false
+        # Locks down those users until they have been cleared by the admin (default: true).
+        block_auto_created_users: true
+
+        ## Auth providers
+        # Uncomment the following lines and fill in the data of the auth provider you want to use
+        # If your favorite auth provider is not listed you can use others:
+        # see https://github.com/gitlabhq/gitlab-public-wiki/wiki/Custom-omniauth-provider-configurations
+        # The 'app_id' and 'app_secret' parameters are always passed as the first two
+        # arguments, followed by optional 'args' which can be either a hash or an array.
+        providers:
+        # - { name: 'google_oauth2', app_id: 'YOUR APP ID',
+        #     app_secret: 'YOUR APP SECRET',
+        #     args: { access_type: 'offline', approval_prompt: '' } }
+        # - { name: 'twitter', app_id: 'YOUR APP ID',
+        #     app_secret: 'YOUR APP SECRET'}
+        # - { name: 'github', app_id: 'YOUR APP ID',
+        #     app_secret: 'YOUR APP SECRET',
+        #     args: { scope: 'user:email' } }
+    ```
+3. Change `enabled` to `true`.
+4. Consider the next two configuration options: `allow_single_sign_on` and `block_auto_created_users`.
+    * `allow_single_sign_on` defaults to `false`. If `false` users must be created manually or they will not be able to
+    sign in via OmniAuth.
+    * `block_auto_created_users` defaults to `true`. If `true` auto created users will be blocked by default and will
+    have to be unblocked by an administrator before they are able to sign in.
+    * **Note:** If you set `allow_single_sign_on` to `true` and `block_auto_created_users` to `false` please be aware
+    that any user on the Internet will be able to successfully sign in to your GitLab without administrative approval.
+5. Choose one or more of the Supported Providers below to continue configuration.
+
+### Supported Providers
+
++ [GitHub](github.md)
++ [Google](google.md)
++ [Twitter](twitter.md)
+
+### Enable OmniAuth for an Existing User
+
+Existing users can enable OmniAuth for specific providers after the account is created. For example, if the user
+originally signed in with LDAP an OmniAuth provider such as Twitter can be enabled. Follow the steps below to enable an
+OmniAuth provider for an existing user.
+
+1. Sign in normally - whether standard sign in, LDAP, or another OmniAuth provider.
+2. Go to profile settings (the silhouette icon in the top right corner).
+3. Select the "Account" tab.
+4. Under "Social Accounts" select the desired OmniAuth provider, such as Twitter.
+5. The user will be redirected to the provider. Once the user authorized GitLab they will be redirected back to GitLab.
+
+The chosen OmniAuth provider is now active and can be used to sign in to GitLab from then on.