Add initial Microsoft Teams support

Documentation on https://github.com/42wim/matterbridge/wiki/MS-Teams-setup

vendor/github.com/yaegashi/msgraph.go/beta/EventMessageModel.go

@@ -0,0 +1,29 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+// EventMessage undocumented
+type EventMessage struct {
+	// Message is the base model of EventMessage
+	Message
+	// MeetingMessageType undocumented
+	MeetingMessageType *MeetingMessageType `json:"meetingMessageType,omitempty"`
+	// StartDateTime undocumented
+	StartDateTime *DateTimeTimeZone `json:"startDateTime,omitempty"`
+	// EndDateTime undocumented
+	EndDateTime *DateTimeTimeZone `json:"endDateTime,omitempty"`
+	// Location undocumented
+	Location *Location `json:"location,omitempty"`
+	// Type undocumented
+	Type *EventType `json:"type,omitempty"`
+	// Recurrence undocumented
+	Recurrence *PatternedRecurrence `json:"recurrence,omitempty"`
+	// IsOutOfDate undocumented
+	IsOutOfDate *bool `json:"isOutOfDate,omitempty"`
+	// IsAllDay undocumented
+	IsAllDay *bool `json:"isAllDay,omitempty"`
+	// IsDelegated undocumented
+	IsDelegated *bool `json:"isDelegated,omitempty"`
+	// Event undocumented
+	Event *Event `json:"event,omitempty"`
+}