Create ecosystem-guide.md

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+# Ecosystem Guide
+
+## Graphics
+
+- 2D only. All you need is...
+  - love: [ggez](https://github.com/ggez/ggez)
+  - web: [quicksilver](https://github.com/ryanisaacg/quicksilver)
+  - coffee: [coffee](https://github.com/hecrj/coffee)
+  - not sure: [piston](https://github.com/PistonDevelopers/piston)
+- 3D all the way. Your sort of vacation is...
+  - all inclusive:
+    - [amethyst](https://github.com/amethyst/amethyst)
+  - exploratory drive-by:
+    - [kiss3d](https://github.com/sebcrozet/kiss3d)
+    - [three.rs](https://github.com/three-rs/three)
+  - rent:
+    - (all APIs) [wgpu](https://github.com/gfx-rs/wgpu-rs)
+    - (GL only) [glium](https://github.com/glium/glium)
+    - (GL only) [luminance](https://github.com/phaazon/luminance-rs)
+    - (Vulkan only) [vulkano](https://github.com/vulkano-rs/vulkano)
+  - immigration:
+    - (all) [gfx-hal](https://github.com/gfx-rs/gfx)
+    - (GL) [gl-rs](https://github.com/brendanzab/gl-rs)
+    - (Vulkan) [ash](https://github.com/MaikKlein/ash)
+    - (Vulkan) [dacite](https://gitlab.com/dennis-hamester/dacite)
+
+## Math
+
+## Audio
+
+TODO