Added dropdown to the navbar component

[shriya-tiwari]

I have added the dropdown component as a solution to the issue #4 . @nishant-ai kindly have a look.

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[nishant-ai]

Hi! @shriya-tiwari! Can you please resolve the conflicts? Thanks in advance! Just ping me whenever conflicts are resolved! I'll surely Accept the PR!

[shriya-tiwari]

@nishant-ai can you please guide me a little bit on how to resolve conflicts