Create Introduction to Data Structures.md

Created an introductory guide to data structures in Java, covering primitive and non-primitive types, linear and non-linear structures, with detailed explanations and examples for each category.

Author: nimeshkavindu

Diff for: Introduction to Data Structures.md

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+## What are Data Structures in Java?
+
+Data Structure in Java is defined as the collection of data pieces that offer an effective means of storing and organizing data in a computer. Linked List, Stack, Queue, and arrays are a few examples of Java data structures.
+
+There are two types of Data Structures:-
+
+1. **Primitive Data Structures**
+2. **Non-primitive Data Structures**
+
+### Primitive Data Structures
+Primitive data Structures are also called Primitive Data Types. `byte`, `short`, `int`, `float`, `char`, `boolean`, `long`, and `double` are primitive Data types.
+
+### Non-primitive Data Structures
+Non-primitive Data Structures are of two types:-
+
+1. **Linear Data Structures**
+2. **Non-linear Data Structures**
+
+### Linear Data Structures
+The elements arranged in a linear fashion are called Linear Data Structures. Here, each element is connected to one other element only. Linear Data Structures are as follows:
+
+- **Arrays**
+    - Single dimensional Array
+    - Multidimensional Array
+- **Stack**
+- **Queue**
+- **Linked List**
+    - Singly-linked list
+    - Doubly Linked list
+    - Circular Linked List
+
+### Non-Linear Data Structures
+The elements arranged in a non-linear fashion are called Non-Linear Data Structures. Here, each element is connected to n-other elements. Non-Linear Data Structures are as follows:
+
+- **Trees**
+    - Binary Tree
+    - Binary Search Tree
+    - AVL Tree
+    - Red-Black Tree
+- **Graph**
+- **Heap**
+    - MaxHeap
+    - MinHeap
+- **Hash**
+    - HashSet
+    - HashMap