Add a responsive navbar based on design file given in readme.

[jzf21]

[nikita22panwar]

Can you please assign it to me?

[jzf21]

Sure

[nikita22panwar]

@jzf21 I added the navbar let me know if you want to change anything
can you please add label of hacktoberfest

[jzf21]

Can you add a hamburger menu with dropdown for mobile views

[nikita22panwar]

@jzf21 sure! but can I do this in another PR and also can you please add hacktoberfest label

[jzf21]

Can you pull again and push

[sakshivbp1812]

@jzf21 Can you please assign it to me?