move license stuff into a file

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+LICENSE
+==
+Logos & Design
+---
+The plinky logo and the design of the front panel design and all other graphic elements (both in code and in the documentation and hardware design) are CC BY-SA 4.0. Full text available at https://creativecommons.org/licenses/by-sa/4.0/
+
+Third party elements
+--
+This repository is still somewhat disorganised, and includes some third party code. This includes (but may not be limited to), code generated by the [STM32 Cube IDE](https://www.st.com/en/development-tools/stm32cubeide.html) default project generator; [tinyusb](https://github.com/hathach/tinyusb); [dear imgui](https://github.com/ocornut/imgui) (which in turn uses [gl3w](https://github.com/skaslev/gl3w) and [glfw](https://github.com/glfw/glfw)), [portaudio](https://github.com/PortAudio/portaudio). These projects remain under their original licenses.
+
+Software
+--
+The rest of the software of plinky is licensed under the MIT License https://opensource.org/licenses/MIT
+
+Hardware
+--
+The hardware design is licensed under the permissive CERN open hardware license, CERN-OHL-P v2. Full text is available at https://cern.ch/cern-ohl.
+
+Derived works & Commercial Products
+--
+If you make something with this, I'd love to know! Let me know on [twitter](https://twitter.com/mmalex) 
+
+If you sell or distribute something based on plinky, please make it clear that it is distinct from the original plinky design, and abide by the licenses above.
+My main concern is that the small plinky community, who are focused on discussion of creative audio hardware in general, become burdened with support or other work for a product they didn't actively get involved with. We don't want that! So please be respectful.