Added the implementation of Huffman coding in cpp

[harshendram]

This pull request adds a new implementation of the Huffman coding algorithm using a greedy approach in C++. The code includes all necessary logic to build the Huffman tree and print out the character codes for a given input string.

New Huffman coding algorithm implementation:

• Added huffman_algo.cpp with a complete Huffman coding solution, including tree construction, priority queue logic, and code printing for each character in the input string.

issue no #222
Dear Maintainers
@Pradeepsingh61 @Karanjot786 please add the required labels such as hacktoberfest-accepted and hacktoberfest2025 and merge the PR

[github-actions]

🎉 Welcome to Hacktoberfest 2025, @harshendram! 🎃

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• ✅ Code Validation: Passed
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[github-actions]

🤖 Automated PR Status

🔍 Code Validation

✅ Passed - File naming and structure look good!

🧪 Compilation Tests

✅ Passed - All code compiles successfully!

📋 Overall Status

🎉 Ready for Review - Your PR has passed all automated checks!
👥 Maintainers have been notified for review.

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[Karanjot786]

Hi @harshendram didn't create new issues just open the PR and also fix this PR #221 error

[Karanjot786]

it is good @Pradeepsingh61 now you can merge it

[harshendram]

okay sorry sir @Karanjot786

[Pradeepsingh61]

okay sorry sir @Karanjot786

it's ok