Create same-tree.java and Updated README.md

[sujin0529]

Pull Request Template

Description

Given TreeNode p, q

Check the entire tree and see if it has the same value in the same node location.

Returns true if all nodes have the same value; otherwise false.

Put check marks:

Have you made changes in README file ?

• Added problem & solution under correct topic.
• Specified Space & Time complexity.
• Specified difficulty level, tag & Note(if any).

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also note any relevant details for your test configuration.

• Test A
• Test B

Make sure all below guidelines are followed else PR will get Reject:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code so that it is easy to understand
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[GouravRusiya30]

@sujin0529 Please change file name to "Same-Tree.java"

[GouravRusiya30]

@sujin0529 I haven't see any changes

[sujin0529]

@GouravRusiya30 I changed the file name. Please check.