Add useful matrix setup notes that don't belong in the main matrix repo (these are pure docs)

armbian/matrix.md

@@ -0,0 +1,33 @@
+# System Requirements
+
+- https://matrix.org/docs/guides/faq.html#what-are-synapses-platform-requirements
+
+# Federation Setup / Testing
+
+- https://github.com/matrix-org/synapse/blob/master/README.rst#setting-up-federation
+- https://matrix.org/federationtester/api/report?server_name=domain.tld
+
+# Firewall Rules (firewalld)
+
+```
+# Main Matrix Services
+firewall-cmd --permanent --zone=public --add-port=8448/tcp
+firewall-cmd --permanent --zone=public --add-port=8008/tcp
+firewall-cmd --permanent --zone=public --add-port=8090/tcp
+firewall-cmd --reload
+
+# Turn/voice/video services
+firewall-cmd --permanent --zone=public --add-port=3478/tcp
+firewall-cmd --permanent --zone=public --add-port=3478/udp
+firewall-cmd --permanent --zone=public --add-port=5349/tcp
+firewall-cmd --permanent --zone=public --add-port=5349/udp
+firewall-cmd --reload
+
+```
+
+# Register new users
+
+```
+# Add -a before the url to create a new admin account
+docker exec -it matrix register_new_matrix_user -c /data/homeserver.yaml http://127.0.0.1:8008
+```