Add initial Microsoft Teams support

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

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

@@ -0,0 +1,13 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+// EventMessageResponse undocumented
+type EventMessageResponse struct {
+	// EventMessage is the base model of EventMessageResponse
+	EventMessage
+	// ProposedNewTime undocumented
+	ProposedNewTime *TimeSlot `json:"proposedNewTime,omitempty"`
+	// ResponseType undocumented
+	ResponseType *ResponseType `json:"responseType,omitempty"`
+}