🚀 Add information about API authentication requirements

[bsantosh909]

Is your feature request related to a problem? Please describe.

Need to add a feature to mention if the API can be used without authentication or if it has any authentication system.

Describe the solution you'd like

The first solution is to add the key authentication key with the following values:

• none (e.g. JokeAPI)
• key (e.g. IMDB API)
• oauth (e.g. Discord)

I guess we might need to add another key to indicate if the API requires signup or not. (* This is completely optional)

Describe alternatives you've considered

N/A. Feedbacks are welcome though

Additional context

Anyone working on this issue will have to proof-read all the existing API files and add the key-value to those files.
And also update the frontend to display the data properly on the cards.

Refer to #275 which does similar thing

[thenishantsapkota]

Can I work on this?

[bsantosh909]

Sorry @thenishantsapkota but this is on hold for the time being 🙏