Added assets

doc/branding.md

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+# Branding
+
+## Logo Asset
+
+- Primary vector logo: [`assets/logo-avatar.svg`](../assets/logo-avatar.svg)
+- Primary avatar image: [`assets/logo-avatar.png`](../assets/logo-avatar.png)
+
+## Design Intent
+
+- The avatar combines a terminal frame and a Git branch shape to represent command-line Git workflows.
+- The icon remains legible at small square sizes for profile avatars.
+
+## Usage
+
+- Recommended file: `assets/logo-avatar.png` (`1024x1024`, RGBA).
+- Use `assets/logo-avatar.svg` for scalable documentation and print contexts.
+
+## Cross References
+
+- Documentation index: [`doc/README.md`](README.md)