Update README.md

Author: Rakibul73

README.md

@@ -1,3 +1,6 @@
+> Demo Role = `Teacher` User = `test_sobuj_sir` Pass = `test_sobuj_sir`  <br>
+> Demo Role = `Admin`  User = `rakib` Pass = `rakibrakib` 
+
 <div align="center">
   <h1>🌟 PSTU RTC Project Management (Frontend)🌟 </h1>