Adding license markdown.

[Khalian]

Checklist

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

[EZSwiftExtensionsBot]

	2 Messages
:book:	Executed 185 tests, with 0 failures (0 unexpected) in 4.543 (4.847) seconds
:book:	Executed 170 tests, with 0 failures (0 unexpected) in 4.073 (4.260) seconds

Generated by :no_entry_sign: Danger

[codecov-io]

Codecov Report

Merging #418 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #418   +/-   ##
=======================================
  Coverage   40.28%   40.28%           
=======================================
  Files          49       49           
  Lines        2192     2192           
=======================================
  Hits          883      883           
  Misses       1309     1309

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