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/apparel/README.md

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+# Apparel SVG
+
+Garment-optimized vector files for embroidery, screen printing, and heat transfer on shirts, polos, jackets, and hats.
+
+## Files
+
+| File                            | Color | Description                        |
+|---------------------------------|-------|------------------------------------|
+| `keylink-it-apparel-white.svg`  | White | Full wordmark, white fill          |
+
+## Apparel Placement Guide
+
+| Garment    | Position     | Width       | Logo Version          |
+|------------|--------------|-------------|-----------------------|
+| Polo       | Left chest   | 3.5-4"      | This file             |
+| T-shirt    | Left chest   | 3.5-4"      | This file             |
+| T-shirt    | Full back    | 10-12"      | This file             |
+| Jacket     | Left chest   | 3.5-4"      | This file             |
+| Jacket     | Full back    | 10-12"      | This file             |
+| Hat/Cap    | Front center | 2.5-3"      | KIT alt or K monomark |
+
+## Embroidery Thread
+
+- Cobalt Blue: Madeira Polyneon 1842 or equivalent
+- White: Standard white
+
+## Screen Print Ink
+
+- Cobalt: Pantone 2146 C (closest match to `#0541AD`)
+- White: Standard white
+
+## Notes
+
+- White version is the default for dark garments (navy, black, charcoal).
+- For light-colored garments, use the blue SVG from `../primary/keylink-it-blue.svg`.
+- ViewBox: `0 0 360 144`