Add LICENSE file containing 2, 3 or 4-clause BSD License text

[koobs]

Add a LICENSE file to the repository containing the chosen license text, to indicate explicitly which of the BSD Licenses [1] is specified:

• 2-clause ("Simplified" or "FreeBSD")
• 3-clause ("Revised", "New" or "Modified"), or
• 4-clause ("Original")

I am currently creating a FreeBSD Port for aiohttp, and need to specify this for our license framework requirements.

[1] https://en.wikipedia.org/wiki/BSD_licenses

[asvetlov]

Fixed. I've added simplified 2-clause BSD license in LICENSE.txt file (70b00e1).

[koobs]

Thank you Andrew :)

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