Add initial Microsoft Teams support

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

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

@@ -0,0 +1,17 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+// IdentityProvider undocumented
+type IdentityProvider struct {
+	// Entity is the base model of IdentityProvider
+	Entity
+	// Type undocumented
+	Type *string `json:"type,omitempty"`
+	// Name undocumented
+	Name *string `json:"name,omitempty"`
+	// ClientID undocumented
+	ClientID *string `json:"clientId,omitempty"`
+	// ClientSecret undocumented
+	ClientSecret *string `json:"clientSecret,omitempty"`
+}