feat(synapse): add ansible role

roles/synapse/README.md

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+# `finallycoffee.matrix.synapse` ansible role
+
+## Configuration
+
+### Required
+
+The following variables need to be populated:
+
+- `synapse_domain` - the domain this homeserver should be authoritative for.
+- `synapse_signing_key` - the signing key synapse should use.
+  Set either this or `synapse_role_generate_signing_key: true`.
+
+## Other
+
+- [Configure your database](docs/database.md)
+- [Configure your listeners](docs/listeners.md)
+- [Configure logging](docs/logging.md)
+
+## Deployment methods
+
+### Docker
+
+Set `synapse_deployment_method: docker` to deploy synapse in docker container(s).
+This is currently the default.
+
+### Planned methods
+
+- virtual env + systemd
+- podman