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

svg/primary/README.md

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+# Primary Wordmark (SVG)
+
+Vector versions of the full **Keylink IT** wordmark. These are the preferred files for all production work.
+
+## Files
+
+| File                  | Fill Color | Hex       | Use Case                    |
+|-----------------------|------------|-----------|-----------------------------|
+| `keylink-it-blue.svg` | Cobalt    | `#0541AD` | Default, light backgrounds  |
+| `keylink-it-white.svg`| White     | `#FFFFFF` | Dark or blue backgrounds    |
+| `keylink-it-black.svg`| Black     | `#000000` | Mono print, fax, stamps     |
+
+## Technical Details
+
+- ViewBox: `0 0 500 200`
+- Single layer, single fill color per file
+- No strokes, all paths
+- Compatible with all major design tools, vinyl cutters, and web browsers