Create README.md

Author: xiaobin83

README.md

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+# Unity3D.UnusedBytecodeStripper2.Chain
+
+Unity3D UnusedBytecodeStripper2 wrapper. For processing built dlls before il2cpp.
+
+When unity building iOS player, UnusedBytecodeStripper2 will be used to strip unused code from dlls needs to be converted to C++ code.
+This tool wraps UnusedBytecodeStripper2, make it execute IProcessDll defined in dlls at the same location of UnusedBytecodeStripper2.exe 
+before executing original UnusedBytecodeStripiper2.
+
+The idea came from [Unity3D.UselessAttributeStripper](https://github.com/SaladLab/Unity3D.UselessAttributeStripper).
+
+Check [modified Unity3D.UselessAttributeStripper](https://github.com/xiaobin83/Unity3D.UselessAttributeStripper) and [Unity3D.HotPatchEnabler](https://github.com/xiaobin83/Unity3D.HotPatchEnabler) that work with it.
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