Add Reverse Engineering - Textures

Reverse Engineering - Textures.-.md

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+## General
+
+Textures are usually split into two data blobs:
+
+- Metadata and a small mipmap directly in the bundle
+- All other mipmaps in stream files
+
+### Formats
+
+Formats observed so far:
+
+| FourCC | DXGI |
+|---------|-------|
+| `DX10` | `BC5_UNORM` |
+
+
+## Decompiling
+
+As an initial implementation, decompilation only extracts the largest (i.e. first) mipmap from streamed content.