Added Word Search (Backtracking) in Python

[adwityac]

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Description

I chose to add the Word Search algorithm specifically because it’s a classic problem that many learners encounter when studying backtracking. The grid structure and the need to explore various paths make it an excellent example of how backtracking can be applied effectively.

Additionally, the problem is relatable and commonly found in puzzles, which can make the concept more engaging for users. It also illustrates the practical utility of backtracking in real-world applications, such as text processing and game development. By including Word Search, I aimed to provide a clear and accessible example that enhances understanding of both backtracking and algorithmic problem-solving.

Checklist

• [✅] I've read the contribution guidelines.
• [✅] I've checked the issue list before deciding what to submit.
• I've edited the README.md and link to my code.

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