Added java version of the excersise

java/README.md

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+# Video store kata
+
+Based on the book 'Refactoring' by Martin Fowler. More information on this book can be found on https://martinfowler.com/books/refactoring.html
+
+Imagine a company of theatrical players who go out to various events performing plays. Typically, a customer will request a few plays and the company charges 
+them based on the size of the audience and the kind of play they perform. There are currently two kinds of plays that the company performs: tragedies and comedies. As well as providing a bill for the performance, the company gives its customers “volume credits” which they can use for discounts on future performances—think of it as a customer loyalty mechanism.
+
+Plays.json
+```json
+{
+  "hamlet": {"name": "Hamlet", "type": "tragedy"},
+  "as-like": {"name": "As You Like It", "type": "comedy"},
+  "othello": {"name": "Othello", "type": "tragedy"}
+}
+```
+
+Invoices.json
+```json
+[
+  {
+    "customer": "BigCo",
+    "performances": [
+      {
+        "playID": "hamlet",
+        "audience": 55
+      },
+      {
+        "playID": "as-like",
+        "audience": 35
+      },
+      {
+        "playID": "othello",
+        "audience": 40
+      }
+    ]
+  }
+]
+```