Add authentication document

website/docs/5- functionalities/1-authentication.md

@@ -1,3 +1,27 @@
 ---
 title: Authentication
 ---
+
+Pandora comes with industry-grade authentication system including both user and admin authentication.
+
+## User Authentication
+
+The route definitions can be found [**here**](/docs/api-documentation/redoc#tag/auth).
+
+**Demo User Credentials**
+
+```
+Email: [email protected]
+Password: 123456
+```
+
+## Admin Authentication
+
+The route definitions can be found [**here**](/docs/api-documentation/redoc#tag/adminAuth).
+
+**Demo Admin Credentials**
+
+```
+Email: [email protected]
+Password: 123456
+```