Add initial Microsoft Teams support

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

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

@@ -0,0 +1,15 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+// TimeOff undocumented
+type TimeOff struct {
+	// ChangeTrackedEntity is the base model of TimeOff
+	ChangeTrackedEntity
+	// SharedTimeOff undocumented
+	SharedTimeOff *TimeOffItem `json:"sharedTimeOff,omitempty"`
+	// DraftTimeOff undocumented
+	DraftTimeOff *TimeOffItem `json:"draftTimeOff,omitempty"`
+	// UserID undocumented
+	UserID *string `json:"userId,omitempty"`
+}