Add basic data structures algorithms

[MohitR1999]

Add the basic data structures' codes like implementation of stacks, queues, linked lists, trees, graphs etc.
Feel free to add more of em 😃

[captainaadesh]

Working on this!

[codeboy5]

I would like by adding dfs and bfs for graphs

[MohitR1999]

@captainaadesh @codeboy5 anyone worked this issue out? 🤔