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/primary/README.md

@@ -0,0 +1,21 @@
+# Primary Logo (Wordmark)
+
+The full **Keylink IT** wordmark. This is the default logo for all applications.
+
+## Files
+
+| File                        | Description                              |
+|-----------------------------|------------------------------------------|
+| `keylink-it-blue.png`       | Standard cobalt blue on transparent      |
+| `keylink-it-blue-large.png` | High-res blue variant                    |
+| `keylink-it-blue-wide.png`  | Wide crop (1009x214px) for banners       |
+| `keylink-it-white.png`      | White on transparent, for dark backgrounds |
+| `keylink-it-white-large.png`| High-res white variant                   |
+| `keylink-it-black.png`      | Black on transparent, for mono print     |
+
+## Usage
+
+- Default choice for all branded materials.
+- Minimum width: 150px digital, 1.5" print.
+- Maintain clear space equal to the height of the lowercase "e" on all sides.
+- Vector versions available in `../../svg/primary/`.