added edit distance, LIS and matrix chain multiplication in dynamic p…

[rajdeepdas2000]

…rogramming directory of algorithms

Proposed changes

I have created edit distance, longest increasing subsequence, matrix chain multiplication folders as they were mentioned in algorithms->dynamic programming README file but they were missing from that directory. I also added code in respective folders.

Types of changes

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• Proofreading (fix spelling, grammar, punctuation, accuracy) More about Proofreading
• New Files/Folder (adding folder without removing existing one)
• Add/Remove Files (adding/removing existing files/folder)

Checklist

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• Tested any code against its gcc/clang or the official binaries and it passes locally with my changes
• I have added the necessary explanation
• I have added the necessary links in the working section
• Added external links

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[shhossain]

Approved. Merging.