Initial bot functionality

* The bot now properly joins the management room
* The management room is persisted in the database
* Welcome/help messages are sent in the management room

config/managementroomtext.go

@@ -0,0 +1,38 @@
+package config
+
+type managementRoomText struct {
+	Welcome        string `yaml:"welcome"`
+	Connected      string `yaml:"welcome_connected"`
+	NotConnected   string `yaml:"welcome_unconnected"`
+	AdditionalHelp string `yaml:"additional_help"`
+}
+
+func (m *managementRoomText) validate() error {
+	if m.Welcome == "" {
+		m.Welcome = "Greetings, I am a Discord bridge bot!"
+	}
+
+	if m.Connected == "" {
+		m.Connected = "Use `help` to get started."
+	}
+
+	if m.NotConnected == "" {
+		m.NotConnected = "Use `help` to get started, or `login` to login."
+	}
+
+	return nil
+}
+
+func (m *managementRoomText) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	type rawManagementRoomText managementRoomText
+
+	raw := rawManagementRoomText{}
+
+	if err := unmarshal(&raw); err != nil {
+		return err
+	}
+
+	*m = managementRoomText(raw)
+
+	return m.validate()
+}