Update README.md to add Droid quick start and clarify marketplace usage

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

README.md

@@ -26,6 +26,22 @@ npx claude-plugins install @EveryInc/every-marketplace/compounding-engineering
 
 This automatically adds the marketplace and installs the plugin in a single step.
 
+### Factory (Droid) quick start
+
+1) Install Droid (Factory).
+
+```bash
+bunx droid-factory
+```
+
+What this does: copies Claude Code marketplace commands/agents/subagents and converts them to Droid format.
+
+Next:
+- Start Droid
+- In Settings, enable Sub-agents
+
+You're done: use this source from Droid. You don't need to add it in Claude Code anymore.
+
 ---
 
 # Compounding Engineering Plugin