Create README.md

Author: Generalisk

.github/README.md

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+  # Clean Build
+</div>
+
+Clean Build is A Unity Package that automatically gets rid of unnecessary debug files that are automatically generated during your Unity build.
+
+### Examples of files that will be automatically deleted include:
+- Program Debug Files (PDBs) which often get automatically generated due to Managed Stripping among various other things
+- IL2CPP build files
+- Burst compiler reports
+
+> [!Note]
+> This package does not apply to Development builds