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/monomark/README.md

@@ -0,0 +1,18 @@
+# Monomark (K)
+
+The standalone stylized **K** with the distinctive crossbar element. Used as the brand icon for small-scale applications.
+
+## Files
+
+| File                          | Description                                |
+|-------------------------------|--------------------------------------------|
+| `keylink-k-blue-bg.png`      | White K on cobalt blue square background   |
+| `keylink-k-dark-blue-bg.png` | White K on darker cobalt square background |
+| `keylink-k-transparent.png`  | White K on transparent (for dark surfaces) |
+
+## Usage
+
+- App icons, browser tabs, social media where circular/square crops are needed.
+- Hat embroidery when "KIT" alternate is still too wide.
+- Minimum size: 32px digital, 0.375" print.
+- Maintain clear space equal to 25% of the mark height on all sides.