Create hello_world.cs

[skillinquire]

[RaidAndFade]

Your pull request seems good, but must be checked by a human maintainer for the following reason(s):

1. These submissions must be checked manually because of the potential complexity of submissions, if you've reached this point in the process you're most likely a valid submission.

Please be patient until a maintainer has time to look over your contribution.

This is an automated response, beep boop. if you think there is a mistake, contact a maintainer

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