Add install notes for ShaderFit

README.md

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+# ShaderFit
+
+Client module for Blockland v21. It keeps the shadow map at a size this 32-bit game can allocate.
+
+Place `ShaderFit.dll` in the game's `modules` folder, then quit and start Blockland from Steam. A DLL that is already loaded stays mapped until that restart.
+
+The largest shadow map this build will use is 8192 with 4 cascades. 16384 is 2 GB and the game runs out of memory there, so that size is not used.
+
+The DLL only changes rendering on this client.