Adding PR ettiquette for Contributions.

[Khalian]

Checklist

• [ ] New Extension
• [ ] New Test
• [ ] Changed more than one extension, but all changes are related
• [x] Trivial change (doesn't require changelog)

[EZSwiftExtensionsBot]

	3 Messages
:book:	Executed 202 tests, with 0 failures (0 unexpected) in 6.190 (6.655) seconds
:book:	Executed 187 tests, with 0 failures (0 unexpected) in 4.419 (4.615) seconds
:book:	Executed 124 tests, with 0 failures (0 unexpected) in 4.295 (4.387) seconds

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