Update README.md

Author: Ajithkumar-developer

README.md

@@ -1 +1,12 @@
-# ATM_mini_project
+# ATM_mini_project
+
+this is mini project in python.
+1. Project files details.
+    * this project have only 3 files. 1. atm python file, 2. acounts data handling csv file, 3. transactions data handling csv file.
+    * python file have code for atm operation.
+    * accounts file for holding customer details.
+    * transaction file for handling transactions made by customers.
+ 2. How it works actually?
+    * first you have to login in your acount by valid username and password.
+    * next you can see three options 1.Deposit, 2.Withdraw, 3.List transaction, then you can choose any action.
+    * if you made any transaction, it will be save on file. then you can see what transactions you made.