docs: add Factory installation instructions (#1184)

Author: factory-ben

README.md

@@ -115,6 +115,21 @@ Go to `Cursor Settings` -> `MCP` -> `Add new MCP Server`. Name to your liking, u
 
 </details>
 
+<details>
+<summary>Factory</summary>
+
+Use the Factory CLI to add the Playwright MCP server:
+
+```bash
+droid mcp add playwright "npx @playwright/mcp@latest"
+```
+
+Alternatively, type `/mcp` within Factory droid to open an interactive UI for managing MCP servers.
+
+For more information, see the [Factory MCP documentation](https://docs.factory.ai/cli/configuration/mcp).
+
+</details>
+
 <details>
 <summary>Gemini CLI</summary>