add readme and third party credits

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+# THIRD PARTY
+
+Things in this project that I didn't write.
+
+## Code
+
+All of these are in [ext](ext), unchanged.
+
+| name | what for | license | where from |
+| --- | --- | --- | --- |
+| stb_image | loading png and other images | public domain or MIT, your pick | https://github.com/nothings/stb |
+| stb_truetype | ttf fonts | public domain or MIT, your pick | https://github.com/nothings/stb |
+| miniaudio | audio output and mic input | public domain or MIT No Attribution, your pick | https://github.com/mackron/miniaudio |
+| cgltf | reading glTF in the model converter | MIT | https://github.com/jkuhlmann/cgltf |
+
+The text of each license is at the top or bottom of its header.
+
+## Fonts
+
+The built-in 8x13 bitmap font in [konfont.h](kon/konfont.h) is derived from the misc-fixed fonts, which are public domain. Check the font's own notice before you use this font data outside of this project.
+
+If you put a `font.ttf` in your assets, that font has its own license and it's yours to check.
+
+## Art
+
+### Fox (example model)
+
+Used by the modelview example, in `art/models/Fox.glb`.
+
+- the model: CC0
+- rigging and animation: CC-BY 4.0, by tomkranis
+- the glTF conversion: @AsoboStudio and @scurest
+- from the Khronos glTF sample models: https://github.com/KhronosGroup/glTF-Sample-Models
+
+CC-BY 4.0 needs a credit when you share it: https://creativecommons.org/licenses/by/4.0/
+
+If you ship a game that includes the fox, put the credit in your game's credits too.