Local develop setup with docker (#1103)

* Add local live kit backend run setup

backend/livekit.yaml

@@ -0,0 +1,26 @@
+port: 7880
+environment: dev
+bind_addresses:
+  - "0.0.0.0"
+rtc:
+  tcp_port: 7881
+  port_range_start: 50100
+  port_range_end: 50200
+  use_external_ip: false
+#redis:
+#    address: redis:6379
+#    username: ""
+#    password: ""
+#    db: 0
+turn:
+  enabled: false
+  domain: localhost
+  cert_file: ""
+  key_file: ""
+  tls_port: 5349
+  udp_port: 443
+  external_tls: true
+keys:
+  devkey: secret
+signal_relay:
+  enabled: true