Init: add short readme describing the project's goal

README.md

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+# NixGLHost
+
+Running OpenGL Nix-built binaries on a foreign Linux distro is quite often a challenge. NixGLHost is gluing your nix-built binaries to the host OpenGL implementation.
+
+# NixGLHost Approach
+
+TODO before release, rephrase this, explain further. Clone the blog post in this section?
+
+1. Patched libGLVnd to load vendor DSOs from a custom location, not relying on the library path.
+1. Copy the host vendor DSOs to a nix-tmp location.
+1. Modify the vendor DSOs runpath to point to the place where the vendor libs live.
+1. Wrap the nix-built binary, inject the libGLVnd-specific env variables to point to the patched vendor lib dir.
+
+# Support
+
+- [ ] Proprietary Nvidia
+  - [ ] GLX
+  - [ ] EGL
+  - [ ] Cuda
+  - [ ] OpenCL
+- [ ] Mesa
+  - [ ] GLX
+  - [ ] EGL
+  - [ ] OpenCL
+
+# Alternative Approaches
+
+-  [NixGL](https://github.com/guibou/nixGL): tries to auto detect the host vendor driver, download it again, store it in the nix-store then wraps the nix-built binary and inject the downloaded vendor driver through `LD_LIBRARY_PATH`.
+
+# Authors/Maintainers
+
+- [Flokli](https://flokli.de/)
+- [Ninjatrappeur](https://alternativebit.fr/)