Add README.md to every directory

Each subdirectory now has a README with:
- File inventory table
- Usage guidelines and specifications
- Technical details (viewbox, colors, sizes)
- Cross-references to related assets

logos/README.md

@@ -0,0 +1,12 @@
+# Logos
+
+Raster (PNG) versions of all Keylink IT logo marks. For production print and vinyl cutting, prefer the vector SVGs in `../svg/`.
+
+## Subdirectories
+
+| Directory     | Contents                                          |
+|---------------|---------------------------------------------------|
+| `primary/`    | Full "Keylink IT" wordmark in blue, white, black  |
+| `alternate/`  | Abbreviated "KIT" logo                            |
+| `monomark/`   | Standalone stylized "K" mark                      |
+| `colormark/`  | (Reserved for future circular badge variants)     |