Create Tree_Diagonal_Traversal.cpp

[SreenathMopuri]

Fixes #

Checklist:

• ] 4 space indentation
• Coding conventions are followed.
• Input is taken dynamically.
• Sample Input / Output is added at the end of file.
• Logic Documentation (Comments).
• File names are correct.

Make sure these boxes are checked before your pull request (PR) is ready to be reviewed and merged. Thanks!

Changes proposed in this pull request:

• I have created C++ solution for Tree Diagonal Traversal.

Languages Used:

-C++

Files Added:

• Yes, Tree_Diagonal_Traversal.cpp

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Thanks!