Added CPP codes for Lecture 78, 85, 94, 97 #543
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I have added the C++ codes for the following lectures:
Lectures 78: Intro to Hashmaps
Lecture 85: Intro to Graphs
Lecture 94: Shortest Distance in a DAG
Lecture 97: Disjoint Set_Union by rank and Minimum Spanning tree
Also added a .gitignore file to avoid committing .exe files and .vscode folder containing IDE configs.