Add initial Microsoft Teams support

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

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

@@ -0,0 +1,13 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+// AuditActivityInitiator undocumented
+type AuditActivityInitiator struct {
+	// Object is the base model of AuditActivityInitiator
+	Object
+	// User undocumented
+	User *UserIdentity `json:"user,omitempty"`
+	// App undocumented
+	App *AppIdentity `json:"app,omitempty"`
+}