Add initial Microsoft Teams support

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

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

@@ -0,0 +1,19 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+// WebAccount undocumented
+type WebAccount struct {
+	// ItemFacet is the base model of WebAccount
+	ItemFacet
+	// Description undocumented
+	Description *string `json:"description,omitempty"`
+	// UserID undocumented
+	UserID *string `json:"userId,omitempty"`
+	// Service undocumented
+	Service *ServiceInformation `json:"service,omitempty"`
+	// StatusMessage undocumented
+	StatusMessage *string `json:"statusMessage,omitempty"`
+	// WebURL undocumented
+	WebURL *string `json:"webUrl,omitempty"`
+}