Added DuplicateChars to README

Author: mepox

README.md

@@ -63,6 +63,7 @@ Basics of Java are covered within these programs.
 • <a href="https://github.com/SVijayB/JavaSpace/blob/master/Basics/strong number.java">Strong number.java</a>            | Check for Strong number.
 • <a href="https://github.com/SVijayB/JavaSpace/blob/master/Basics/Fibonacci.java">Fibonacci.java</a>                | To find Fibonacci series up to a given number.
 • <a href="https://github.com/SVijayB/JavaSpace/blob/master/Basics/FizzBuzz.java">FizzBuzz.java</a>                | The FizzBuzz problem is a classic test given in coding interviews.
+• <a href="https://github.com/SVijayB/JavaSpace/blob/master/Basics/DuplicateChars.java">DuplicateChars.java</a>                | A simple program that checks a string for duplicate characters.
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