Update ReadMe.md

Author: Afreen97

ReadMe.md

@@ -1,3 +1,5 @@
+This is a solution to the problem --> https://www.geektrust.com/coding/detailed/metro-card
+
 # Pre-requisites
 * Java 1.8/1.11/1.15
 * Maven
@@ -28,4 +30,4 @@ Internally both the scripts run the following commands
 # Help
 
 You can refer our help documents [here](https://help.geektrust.com)
-You can read build instructions [here](https://github.com/geektrust/coding-problem-artefacts/tree/master/Java)
+You can read build instructions [here](https://github.com/geektrust/coding-problem-artefacts/tree/master/Java)