Added solution to Median of Two Sorted Array - Leetcode(04)

[Devansh-gaur-1611]

Describe the changes you've made

I have added the solution of leetcode problem 4 in java language

Mention any unusual behaviour of your code (Write NA if not)

NA

Checklist:

(To mark, write x inside the square brackets like this: [x])

• [x] My code follows the guidelines of this project and hacktoberfest.
• [x] I have performed a self-review of my own code and also ran the code on my local machine and leetcode system.
• [x] I have commented on my code, particularly wherever it was hard to understand.
• [x] My changes generate no new warnings.

[Ketan2010]

Thanks @Devansh-gaur-1611 for the contribution.