Add initial Microsoft Teams support

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

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

@@ -0,0 +1,17 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+import "time"
+
+// BookingReminder undocumented
+type BookingReminder struct {
+	// Object is the base model of BookingReminder
+	Object
+	// Offset How much time before an appointment the reminder should be sent.
+	Offset *time.Duration `json:"offset,omitempty"`
+	// Recipients Who should receive the reminder.
+	Recipients *BookingReminderRecipients `json:"recipients,omitempty"`
+	// Message Message to send.
+	Message *string `json:"message,omitempty"`
+}