Add initial Microsoft Teams support

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

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

@@ -0,0 +1,17 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+// ACL undocumented
+type ACL struct {
+	// Object is the base model of ACL
+	Object
+	// Type undocumented
+	Type *ACLType `json:"type,omitempty"`
+	// Value undocumented
+	Value *string `json:"value,omitempty"`
+	// AccessType undocumented
+	AccessType *AccessType `json:"accessType,omitempty"`
+	// IdentitySource undocumented
+	IdentitySource *string `json:"identitySource,omitempty"`
+}