assets, README: adds hero image, nav, and bridge mode (#21)

Signed-off-by: Remy Guercio <remy@tailscale.com>

Author: remyguercio

README.md

@@ -1,7 +1,18 @@
-# aperture-cli
+<h1 align="center">aperture-cli</h1>
+
+<p align="center">
+  <a href="#supported-agents">Supported agents</a> |
+  <a href="#installation">Installation</a> |
+  <a href="#usage">Usage</a> |
+  <a href="#development">Development</a>
+</p>
+
+<p align="center">
+  <img src="./assets/aperture-hero.png" alt="Aperture CLI">
+</p>
 
 > [!WARNING]
-> **This repository is experimental.** It is under active development, may change significantly without notice.
+> **This repository is alpha software.** It is under active development and may change significantly without notice.
 
 A CLI launcher for coding agents preconfigured to work with [Aperture](https://aperture.tailscale.com). It manages installation, configuration and environment variables that make using multiple providers and models very easy.
 
@@ -11,6 +22,8 @@ A CLI launcher for coding agents preconfigured to work with [Aperture](https://a
 - [Gemini CLI](https://github.com/google-gemini/gemini-cli)
 - [OpenCode](https://github.com/sst/opencode)
 - [Codex](https://github.com/openai/codex)
+- [GitHub Copilot CLI](https://docs.github.com/en/copilot/how-tos/copilot-cli/cli-getting-started)
+- [Claude Cowork](https://support.claude.com/en/articles/13345190-get-started-with-claude-cowork)
 
 ## Installation
 
@@ -32,6 +45,21 @@ aperture
 
 On first run, `aperture` will attempt to connect to `http://ai`. If it cannot reach that host, it will prompt you to configure an Aperture endpoint.
 
+### Bridge mode
+
+Bridge mode lets Aperture CLI reach an Aperture endpoint through an embedded Tailscale node. Only the Aperture CLI proxy appears on the tailnet; the rest of the machine does not need the full Tailscale client installed or connected to that tailnet.
+
+This is useful on machines where installing Tailscale is not practical, where Aperture needs to work alongside another VPN, or where you need to switch tailnets while continuing to use a single Aperture instance.
+
+To use bridge mode:
+
+1. Open `Settings`, then open `Bridges` and press `a` to add a bridge.
+2. Go back to `Settings`, then open `Aperture Endpoints` and press `a` to add an endpoint.
+3. Choose `Bridge`, select the bridge you created, then enter the Aperture URL.
+4. Select the bridged endpoint so it becomes active.
+5. Follow the Tailscale login prompt for the bridge.
+6. Launch an agent.
+
 ### Flags
 
 | Flag | Description |