Update readme

Author: lightningterror

README.md

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-# mesa3D-Windows
+# mesa3D-Windows
+
+Please support the official MESA repository at https://gitlab.freedesktop.org/mesa/mesa
+
+This work is based on https://fdossena.com/?p=mesa/index.frag which attempts to compile MESA using Scons for Windows.   
+Compilation guide from https://fdossena.com/?p=mesa/build.frag   
+Latest mesa to officialy support Scons is 21.0.3.   
+
+## Compatibility
+
+Compiled using Windows 10 and verified to work.