Add DFS and BFS of the directed and undirected graphs in different languages.

[ag278]

Proposal

Add the code for the above algorithms

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[akshatanand186]

I would like to implement these in C++

[ag278]

Assigned the issue to @akshatanand186 in C++

[ritik3131]

Hey @ag278 ,I would like to implement these issue in C

[vishnu921]

I would like to implement these algorithms in python.

[ag278]

Assigned the issue to @ritik3131 in C

[ag278]

Assigned the issue to @vishnu921 in Python

[Shashwat545]

@ag278 I would like to implement these in Java