Update ReadMe

Author: AhmedLSayed9

README.md

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-# Algorithms and Data Structures implemented in Dart.
+### Implementation of several algorithms and data structures in Dart.
+
+## Contents
+
+### Problem Solving Patterns
+* [Frequency Counter Pattern](https://github.com/AhmedLSayed9/dart_algorithms_and_data_structures/tree/master/problem_solving_patterns/frequency_counter)
+* [Multiple Pointers Pattern](https://github.com/AhmedLSayed9/dart_algorithms_and_data_structures/tree/master/problem_solving_patterns/multiple_pointers)
+* [Sliding Window Pattern](https://github.com/AhmedLSayed9/dart_algorithms_and_data_structures/tree/master/problem_solving_patterns/sliding_window)
+* [Divide and Conquer Pattern](https://github.com/AhmedLSayed9/dart_algorithms_and_data_structures/tree/master/problem_solving_patterns/divide_and_conquer)
+
+### Recursion
+* [Recursion Problem Set](https://github.com/AhmedLSayed9/dart_algorithms_and_data_structures/tree/master/recursion_problem_set)
+
+### Algorithms
+* **Searching Algorithms:**
+    * [Linear Search](https://github.com/AhmedLSayed9/dart_algorithms_and_data_structures/blob/master/searching_algorithms/linear_search.dart)
+    * [Binary Search](https://github.com/AhmedLSayed9/dart_algorithms_and_data_structures/blob/master/searching_algorithms/binary_search.dart)
+    * [Naive String Search](https://github.com/AhmedLSayed9/dart_algorithms_and_data_structures/blob/master/searching_algorithms/naive_string_search.dart)
+    * [KMP String Search](https://github.com/AhmedLSayed9/dart_algorithms_and_data_structures/blob/master/searching_algorithms/kmp_string_search.dart)
+* **Sorting Algorithms:**
+    * Elementary Sorting Algorithms:
+        * [Bubble Sort](https://github.com/AhmedLSayed9/dart_algorithms_and_data_structures/blob/master/sorting_algorithms/bubble_sort.dart)
+        * [Selection Sort](https://github.com/AhmedLSayed9/dart_algorithms_and_data_structures/blob/master/sorting_algorithms/selection_sort.dart)
+        * [Insertion Sort](https://github.com/AhmedLSayed9/dart_algorithms_and_data_structures/blob/master/sorting_algorithms/insertion_sort.dart)
+    * Advanced Sorting Algorithms:
+        * [Merge Sort](https://github.com/AhmedLSayed9/dart_algorithms_and_data_structures/blob/master/sorting_algorithms/merge_sort.dart)
+        * [Quick Sort](https://github.com/AhmedLSayed9/dart_algorithms_and_data_structures/blob/master/sorting_algorithms/quick_sort.dart)
+        * [Radix Sort](https://github.com/AhmedLSayed9/dart_algorithms_and_data_structures/blob/master/sorting_algorithms/radix_sort.dart)
+* **Greedy Algorithms:**
+    * [Dijkstra's Algorithm](https://github.com/AhmedLSayed9/dart_algorithms_and_data_structures/blob/master/data_structures/non_linear/graphs/dijkstra_algorithm.dart)
+
+### Data Structures
+* **Linear:**
+  * [Linked List](https://github.com/AhmedLSayed9/dart_algorithms_and_data_structures/tree/master/data_structures/linear/linked_list)
+  * [Stack](https://github.com/AhmedLSayed9/dart_algorithms_and_data_structures/tree/master/data_structures/linear/stack)
+  * [Queue](https://github.com/AhmedLSayed9/dart_algorithms_and_data_structures/tree/master/data_structures/linear/queue)
+  * [Hash Table (Hash Map)](https://github.com/AhmedLSayed9/dart_algorithms_and_data_structures/tree/master/data_structures/linear/hash_maps)
+* **Non-Linear:**
+  * Trees:
+    * [Binary Search Tree](https://github.com/AhmedLSayed9/dart_algorithms_and_data_structures/tree/master/data_structures/non_linear/trees/binary_trees)
+    * [Binary Heap](https://github.com/AhmedLSayed9/dart_algorithms_and_data_structures/tree/master/data_structures/non_linear/trees/heaps)
+    * [Priority Queue (Heap-Based)](https://github.com/AhmedLSayed9/dart_algorithms_and_data_structures/blob/master/data_structures/non_linear/trees/heaps/heap_based_priority_queue.dart)
+  * Graphs:
+    * [Graph](https://github.com/AhmedLSayed9/dart_algorithms_and_data_structures/tree/master/data_structures/non_linear/graphs)
+
+### Dynamic Programming
+* [Fibonacci Sequence Example](https://github.com/AhmedLSayed9/dart_algorithms_and_data_structures/blob/master/dynamic_programming/fibonacci.dart)