Add initial Microsoft Teams support

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

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

@@ -0,0 +1,15 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+// VpnServer undocumented
+type VpnServer struct {
+	// Object is the base model of VpnServer
+	Object
+	// Description Description.
+	Description *string `json:"description,omitempty"`
+	// Address Address (IP address, FQDN or URL)
+	Address *string `json:"address,omitempty"`
+	// IsDefaultServer Default server.
+	IsDefaultServer *bool `json:"isDefaultServer,omitempty"`
+}