Added fediverse bridge draft

roles/web-app-bridgy-fed/README.md

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+# Bridgy Fed
+
+## Description
+Bridgy Fed bridges ActivityPub (Fediverse), ATProto/Bluesky, and IndieWeb (webmentions/mf2). It mirrors identities and interactions across networks.
+
+## Overview
+This role builds and runs Bridgy Fed as a Docker container and (optionally) starts a Datastore-mode Firestore emulator as a sidecar. It exposes HTTP locally for a front proxy.
+
+Upstream docs & dev notes:
+- User & developer docs: https://fed.brid.gy and https://bridgy-fed.readthedocs.io/
+- Source: https://github.com/snarfed/bridgy-fed
+- Local run (reference): `flask run -p 8080` with APPVIEW_HOST/PLC_HOST/BGS_HOST/PDS_HOST set, and Datastore emulator envs
+
+## Features
+- Dockerized Flask app (gunicorn)
+- Optional Firestore emulator (Datastore mode) sidecar
+- Front proxy integration via `sys-stk-front-proxy`
+
+## Quick start
+1) Set domains and ports in inventory.  
+2) Enable/disable the emulator in `config/main.yml`.  
+3) Run the role; your front proxy will publish the app.
+
+## Notes
+- Emulator is **not** for production; it’s in-memory unless you mount a volume/configure import/export.