Update README.md

Author: MainakRepositor

README.md

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+  <li><a href="https://github.com/MainakRepositor/Java-Solutions/tree/master/searchingandsorting">Searching and Sorting</a></li>
+  <li><a href="https://github.com/MainakRepositor/Java-Solutions/tree/master/array">Arrays</a></li>
+  <li><a href="https://github.com/MainakRepositor/Java-Solutions/tree/master/mattrix">Matrices</a></li>
+  <li><a href="https://github.com/MainakRepositor/Java-Solutions/tree/master/LinkedList">Linked Lists</a></li>
+  <li><a href="https://github.com/MainakRepositor/Java-Solutions/tree/master/binnarytree">Binary Tree</a></li>
+  <li><a href="https://github.com/MainakRepositor/Java-Solutions/tree/master/binarysearchtree">Binary Search Tree</a></li>
+  <li><a href="https://github.com/MainakRepositor/Java-Solutions/tree/master/heap">Heaps</a></li>
+  <li><a href="https://github.com/MainakRepositor/Java-Solutions/tree/master/graphs">Graphs</a></li>
+  <li><a href="https://github.com/MainakRepositor/Java-Solutions/tree/master/strings">Strings</a></li>
+  <li><a href="https://github.com/MainakRepositor/Java-Solutions/tree/master/miscelaneous">Miscellaneous</a></li>
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   </ol>