Added stubbed function for logging in staff

src/main/kotlin/service/StaffService.kt

@@ -11,13 +11,17 @@ class StaffService(private val connection: Connection) {
         private const val SELECT_STAFF_BY_ID = ""
         private const val INSERT_STAFF = ""
         private const val UPDATE_STAFF_BY_ID = ""
-        // In the event  are "deleted" erroneously, having a flag set instead of actually removing the entry allows
+        // In the event staff are "deleted" erroneously, having a flag set instead of actually removing the entry allows
         // for quick reversal.
         private const val ARCHIVE_STAFF_BY_ID = ""
     }
 
     suspend fun create() {}
 
+    fun loginStaffByLoginUsername(username: String, password: String): Boolean {
+        return true
+    }
+
     suspend fun read() {}
 
     suspend fun update() {}