Problem 3 is added along with code and Explanatory Approach

[bhawarth-garg]

…ong with the explanatory Approach.

This is a template on how to fill out a PR properly.

Description

• Language Used: Java
• Approach Used: Two pointer Approach
• Question(s) Solved: 1 (Q3: Longest Substring Without Repeating Characters)
• Issue(s) related:

  Q3: Longest Substring Without Repeating Characters:- to find the length of the largest substring of given substring such that no element is repeating in that substring.

  Approach is explained in code itself. This Question can also be done using Sliding Window Approach.

Related Issue

Acceptance Criteria

Type of Changes

	Type
	:bug: Bug fix
	:sparkles: New feature
	:hammer: Refactoring
	:100: Add tests
	:link: Update dependencies
	:scroll: Docs

Testing Steps / QA Criteria

Q3: Longest Substring Without Repeating Characters

[bhawarth-garg]

Ths request is under the issue "solutions in JAVA for Q1 to Q10 "

[DugarRishab]

Okay. Great work @bhawarth-garg