Added GDPR docs

docs/installation/configuration-options.md

@@ -7,10 +7,41 @@ The module comes with a set of attributes to configure. The following is the lis
 
 Setting this attribute will allow users to configure their login process with two-factor authentication. 
 
-### twoFactorAuthenticationCycles (type: `integer`, default: `1`)
+#### twoFactorAuthenticationCycles (type: `integer`, default: `1`)
 
 By default, Google Authenticator App for two-factor authentication cycles in periods of 30 seconds. In order to allow 
-a bigger period so to avoid out of sync issues. 
+a bigger period so to avoid out of sync issues.
+
+#### enableGDPRcompliance (type: `boolean`, default: `false`)
+
+Setting this attribute enables a serie of measures to comply with EU GDPR regulation, like data consent, right to be forgotten and data portability.
+
+#### GDPRprivacyPolicyUrl (type: `array`, default: null)
+The link to privacy policy. This will be used on registration form as "read our pivacy policy". It must follow the same format as `yii\helpers\Url::to`
+
+#### GDPRexportProperties (type: `array`)
+
+An array with the name of the user identity properties to be included when user request download of his data.
+Names can include relations like `profile.name`.
+
+Defaults to:
+```php
+      [
+        'email',
+        'username',
+        'profile.public_email',
+        'profile.name',
+        'profile.gravatar_email',
+        'profile.location',
+        'profile.website',
+        'profile.bio'
+      ]
+```
+
+
+#### GDPRanonymPrefix (type: `string`, default: `GDPR`)
+Prefix to be used as a replacement when user requeste deletion of his data
+
 
 #### enableRegistration (type: `boolean`, default: `true`)