NRZ inverted encoder & decoder for Quartus compiler only

通信原理中的几种最基本的编码方式的详细讲解，例如NRZ，AMI，Manchester等等，进行通信编码工作时必备参考文档-Communication theory to explain in detail the basic coding of several methods, such as NRZ, AMI, Manchester, etc., to communicate essential reference document coding