adding CC license

Author: maholli

README.md

@@ -7,3 +7,9 @@ Design discussions, engineering justifications, and qualification data
 - [ ] PyCubed pinout/infographic
 - [ ] KickSat-2 vibe qualification data (awaiting approval) 
 - [ ] Full radiation test data (awaiting Journal approval)
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+<a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/88x31.png" /></a><br />This work is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution 4.0 International License</a>.