media: Define proper license for all media

media/README.md

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+# StreamFX Media
+All media content related to or owned by StreamFX. If not specified otherwise, content is licensed under <a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/">Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License</a>.
+
+## License
+### Overall
+<a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png" float="left" />This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License</a>.
+
+### `thankyou_cat.png/tiff`, `thankyou_fox.png/tiff`, `thankyou_otter.png/tiff`
+The images were created by [Inga Potejto](https://twitter.com/IngaPotejto) for use within the StreamFX project only. No sublicense of any kind is granted to any person or entity for use outside of the StreamFX project.