No License File Included

[ebarrieau]

I am using portions of this code to create a Node-RED node for PID control and want to give proper attribution, but there is no license file in this repository. The MIT license requires that I reproduce the original copyright and license with my distribution, but no license file is provided. In the meantime, I have added the block from the README file which states the repository name and version, your email, and the assertion of the MIT license, but I would prefer to include an actual copyright and license file for this repository.