Update the documentation

Add "front-end process.PNG" in the md.

Author: SamFu1113

README.md

@@ -116,7 +116,7 @@
 	![image info](photos/Helen.PNG)	![image info](photos/arrow.PNG)	![image info](photos/Mary.PNG)
 
 5. Database management program with auto recovery.
-
+	![image info](photos/front-end process.PNG) 
 
 6. Matrix mulplication in parallel.
 	  ![image info](photos/mulplication.PNG)\