Create NullableAnnot.java

[Shahil093]

#6510

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[jbduncan]

@Shahil093 Welcome to Guava, again!

I don't know if you've seen the contribution guidelines yet, but on a cursory look, it looks like this PR doesn't really add anything to Guava and is very unlikely to be accepted, for two reasons:

1. The story you linked to is about annotating existing code with results from the mentioned paper, whereas your code just adds new, example code, so unless you're the author of the paper, this story probably wouldn't be a good one to pick up.
2. Guava very rarely accepts external contributions nowadays for reasons noted in the contribution guidelines, with small bug fixes and documentation fixes being two notable exceptions.

If you're looking you get into open source, then you may find this this advice and this advice I wrote many years ago helpful.

I hope this helps!

[chaoren]

Thanks for looking into this and responding, @jbduncan. Indeed, this PR seems to be coming from a misunderstanding of #6510.