Add initial Microsoft Teams support

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

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

@@ -0,0 +1,15 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+// AddIn undocumented
+type AddIn struct {
+	// Object is the base model of AddIn
+	Object
+	// ID undocumented
+	ID *UUID `json:"id,omitempty"`
+	// Type undocumented
+	Type *string `json:"type,omitempty"`
+	// Properties undocumented
+	Properties []KeyValue `json:"properties,omitempty"`
+}