Add initial Microsoft Teams support

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

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

@@ -0,0 +1,15 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+import "time"
+
+// BookingWorkTimeSlot undocumented
+type BookingWorkTimeSlot struct {
+	// Object is the base model of BookingWorkTimeSlot
+	Object
+	// Start undocumented
+	Start *time.Time `json:"start,omitempty"`
+	// End undocumented
+	End *time.Time `json:"end,omitempty"`
+}