Feature request: Add lib command

[Puneet Gopinath]

Please check these things before submitting your issue:

• I searched for duplicate or closed feature request here

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

N/A.

Describe the solution you'd like

Add a lib or library command, which mentions that Priya bot was made using discord.py.

Describe alternatives you've considered

N/A.

Additional context

Example message:

Discord.py v1
We are opensource, you can check out source code at [GitHub](https://github.com/chinnupavan/priya-bot)

Note: I don't know which version of discord.py you use, so I simply mentioned v1