Add initial Microsoft Teams support

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

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

@@ -0,0 +1,21 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+// ScheduleItem undocumented
+type ScheduleItem struct {
+	// Object is the base model of ScheduleItem
+	Object
+	// Start undocumented
+	Start *DateTimeTimeZone `json:"start,omitempty"`
+	// End undocumented
+	End *DateTimeTimeZone `json:"end,omitempty"`
+	// IsPrivate undocumented
+	IsPrivate *bool `json:"isPrivate,omitempty"`
+	// Status undocumented
+	Status *FreeBusyStatus `json:"status,omitempty"`
+	// Subject undocumented
+	Subject *string `json:"subject,omitempty"`
+	// Location undocumented
+	Location *string `json:"location,omitempty"`
+}