updated readme.md file

NirmalSilwal · web-flow · commit a32eb3290bba · 2020-04-03T19:01:40.000+05:30
diff --git a/README.md b/README.md
@@ -1,2 +1,7 @@
 # Calculator_using_Java
-simple calculator for basic math operation developed using Java, AWT, Swing
+
+Simple calculator for basic math operation developed using Java, AWT, Swing.
+
+### Main_Calculator.java  is the file containing main method.
+
+### Calculator.java has all the logic for calculator that uses AWT and Swing for the implementation.
