[ADD] documentation for scraper added

Author: MaheshBharadwaj

Scripts/Web_Scrappers/LeetCode_Scraper/README.md

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+# LeetCode Scraper
+
+Takes [LeetCode](https://leetcode.com/) problem code as command line argument scrapes the problem statement and saves it in a text file.
+
+### Prerequisites
+
+Installing prerequisites:
+```bash
+$pip install -r requirements.txt
+```
+
+### How to run the script
+
+Running the script
+```bash
+$python3 leet_code_scraper.py [problem code]
+```
+### Screenshot/GIF showing the sample use of the script
+
+![Screenshot of output](./output.png)
+
+
+## *Author Name*
+
+[Mahesh Bharadwaj K](https://github.com/MaheshBharadwaj)

Scripts/Web_Scrappers/LeetCode_Scraper/output.png

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+You are given an array of k linked-lists lists, each linked-list is sorted in
+ascending order.
+Merge all the linked-lists into one sorted linked-list and return it.
+ 
+Example 1:
+Input: lists = [[1,4,5],[1,3,4],[2,6]]
+Output: [1,1,2,3,4,4,5,6]
+Explanation: The linked-lists are:
+[
+  1->4->5,
+  1->3->4,
+  2->6
+]
+merging them into one sorted list:
+1->1->2->3->4->4->5->6
+
+Example 2:
+Input: lists = []
+Output: []
+
+Example 3:
+Input: lists = [[]]
+Output: []
+
+ 
+Constraints:
+
+k == lists.length
+0 <= k <= 10^4
+0 <= lists[i].length <= 500
+-10^4 <= lists[i][j] <= 10^4
+lists[i] is sorted in ascending order.
+The sum of lists[i].length won't exceed 10^4.
+
+