Add interactive graph creation using adjacency list

[shanki1001]

What I added:

This program allows the user to create a graph interactively using adjacency list representation. The user can choose whether the graph is directed or undirected, and can add edges to the graph.

Checklist

• Added description of change
• Added file name matches File name guidelines
• Added tests and example, test must pass
• Added documentation so that the program is self-explanatory and educational - Doxygen guidelines
• Relevant documentation/comments is changed or added
• PR title follows semantic commit guidelines
• Search previous suggestions before making a new one, as yours may be a duplicate.
• I acknowledge that all my contributions will be made under the project's license.

Notes: