Add Discord.py masterclass resource

[jb3]

Adds a resource suggested in community meta.

I've scoped it out and believe that:

• It teaches good coding practices for the most part
• It makes good use of type annotations
• It covers a wide range of functionality
• It's content is appropriate and keeps in line with our community expectations

[netlify[bot]]

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[coveralls]

coverage: 100.0%. remained the same when pulling d0c6587c3ffbe41db4c76c6cf4c03a4078b54aa5 on jb3/resources/discord.py-masterclass into 325fda3dddf867a1d90a44ed637fc8f1ab2d0ca4 on main.

[jb3]

You know what I have to say, G.O.A.T

MY HERO!!!!!!