Add configuration example, limit user login

docs/apiserver.conf

@@ -0,0 +1,19 @@
+auth {
+    # Fixed users login credetials
+    # No other user will be able to login
+    fixed_users {
+        enabled: true
+        users: [
+            {
+                username: "jane"
+                password: "12345678"
+                name: "Jane Doe"
+            },
+            {
+                username: "john"
+                password: "12345678"
+                name: "John Doe"
+            },
+        ]
+    }
+}