message: Index.html: Add WDRC Plotter
diff: +<!DOCTYPE html>
  +<html>
  +<head>
  +<title>Tympan_Library Docs</title>
  +</head>
  +<body>
  +WDRC Plotter is here: <a href='https://tympan.github.io/Tympan_Library/WDRC_Plotter.html'>https://tympan.github.io/Tympan_Library/WDRC_Plotter.html</a>
  +</html>
  +
  