Add implementation of Longest Common Subsequence (LCS) algorithm in Python

[tanushrigoel]

📥 Pull Request

Description

Added documentation for longest common subsequence using dynamic programming

Fixes #117

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[tanushrigoel]

Please add hacktoberfest and gssoc-ext label

[ajay-dhangar]

update your code based on suggestions

[ajay-dhangar]

Done