Added config for textroom plugin

configs/janus.plugin.textroom.jcfg

+# room-<unique room ID>: {
+# description = This is my awesome room
+# is_private = true|false (whether this room should be in the public list, default=true)
+# secret = <optional password needed for manipulating (e.g. destroying) the room>
+# pin = <optional password needed for joining the room>
+# post = <optional backend to contact via HTTP post for all incoming messages>
+#}
+
+general: {
+	#admin_key = "supersecret"		# If set, rooms can be created via API only
+									# if this key is provided in the request
+	json = "indented"				# Whether the data channel JSON messages should be indented (default),
+									# plain (no indentation) or compact (no indentation and no spaces)
+	#events = false					# Whether events should be sent to event
+									# handlers (default=true)
+
+	# By default, integers are used as a unique ID for rooms. In case you
+	# want to use strings instead (e.g., a UUID), set string_ids to true.
+	#string_ids = true
+}
+
+room-1234: {
+	description = "Demo Room"
+	# is_private = true
+	secret = "adminpwd"
+	# pin = "roompwd"
+	# post = "http://example.com/forward/here"
+}