[Docs] Configure OIDC

(cherry picked from commit 234764abb4056b683b5726f72d9f04bdd273b95a)

docs/configuration/oidc_configuration.md

@@ -0,0 +1,45 @@
+## Configuration for OIDC
+
+### Context
+- Team Mail ready to work with OIDC both for Mobile and Web version
+
+### How to config
+
+- OIDC_SCOPES: Scopes of OIDC application, each scope is separated by a comma `,`
+- Other configurations depend on the platform:
+
+#### Web:
+- `DOMAIN_REDIRECT_URL`:  URL of your TeamMail web application
+- `WEB_OIDC_CLIENT_ID`: Client ID of your OIDC application
+
+#### Mobile:
+- if you want to change client Id for mobile
+
+For Android: 
+- `/android/app/build.gradle`
+
+```gradle
+        manifestPlaceholders = [
+                'appAuthRedirectScheme': 'teammail.mobile'
+        ]
+```
+
+- `model/lib/oidc/oidc_configuration.dart`
+
+```dart
+  static const String redirectUrlScheme = 'teammail.mobile';
+```
+
+For iOS:
+- `/ios/Runner/Info.plist`
+
+```plist
+    <array>
+        <dict>
+            <key>CFBundleURLSchemes</key>
+            <array>
+                <string>teammail.mobile</string>
+            </array>
+        </dict>
+    </array>
+```