the Quad component does not create a mesh, it creates a single mesh face. A mesh face is a topological entity that connects 3 or 4 mesh vertices.
In order to make a complete mesh, you have to provide both the vertices (your points) and all the faces (your quad). If you only have 4 points, then it's easy, your quad is either {0,1,2,3} or {0,1,3,2}