[Addition of standard greedy algorithms to greedy algorithm file]

[ShubhaSwarup]

Detailed description

I want to add standard greedy algorithms to greedy algorithm file so that to make user understand how exactly greedy algorithms work.

Context

I would be adding these algorithms:
1.Activity Selection Problem
2.Job Sequencing Problem
3.Huffman Coding
4.Huffman Decoding
5.Water Connection Problem

Possible implementation

Additional information

No response

[ShubhaSwarup]

assign this issue to me

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