Adding a 404 page

[ShambhaviSharma0110]

Is your feature request related to a problem? Please describe.
For all the unknown routes that can be looked for I would like to make a 404 page as this is the most neglected page
Describe the solution you'd like
For any unknown route this page would show up

Describe alternatives you've considered
I'll add a 404 page that's it
Additional context
NA

[avinashkranjan]

Hey @ShambhaviSharma0110 This feature has already been worked on and done..in #113