update readme & added image

Author: Dentrax

linked-list-3-deleting-a-node/README.md

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+<h1 align="center">LinkedList Deleting a Node Source</h1>
+
+[What It Is](#what-it-is)
+
+## What It Is
+
+We have discussed **[Linked List Introduction](https://github.com/Dentrax/Data-Structures-with-Go/tree/master/linked-list-1-introduction)** and **[Linked List Insertion](https://github.com/Dentrax/Data-Structures-with-Go/tree/master/linked-list-2-inserting-a-node)** in previous posts on singly linked list.
+Let us formulate the problem statement to understand the deletion process. Given a `key`, delete the first occurrence of this key in linked list.
+
+To delete a node from linked list, we need to do following steps.
+
+* 1) Find previous node of the node to be deleted.
+* 2) Changed next of previous node.
+* 3) Free memory for the node to be deleted.
+
+> * Input: Linked List = `[7 -> 1 -> 3 -> 2]`
+> * Output: Created Linked List `[2 -> 3 -> 1 -> 7]`
+> * Output: Linked List after Deletion of 1: `[2 -> 3 -> 7]`
+
+> * Input: Position = 1, Linked List = `[8 -> 2 -> 3 -> 1 -> 7]`
+> * Output: Linked List =  `[8 -> 3 -> 1 -> 7]`
+
+> * Input: Position = 0, Linked List = `[8 -> 2 -> 3 -> 1 -> 7]`
+> * Output: Linked List =  `[2 -> 3 -> 1 -> 7]`
+
+![Preview Thumbnail](https://raw.githubusercontent.com/Dentrax/Data-Structures-with-Go/master/linked-list-3-deleting-a-node/resources/deleting-a-node.png)
+
+**Algorithm Complexity**
+
+| Complexity		| Notation  |
+| ----------------- |:---------:|
+| `Time Complexity`	| `O(n)`    |