Add initial Microsoft Teams support

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

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

@@ -0,0 +1,13 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+// TeamsAppInstallation undocumented
+type TeamsAppInstallation struct {
+	// Entity is the base model of TeamsAppInstallation
+	Entity
+	// TeamsApp undocumented
+	TeamsApp *TeamsApp `json:"teamsApp,omitempty"`
+	// TeamsAppDefinition undocumented
+	TeamsAppDefinition *TeamsAppDefinition `json:"teamsAppDefinition,omitempty"`
+}