This project is for make plugin at QGIS 3.6
if you are a beginner at make QGIS plugin you can watch this tutorial on youtube that may help you to get some information about download OSGeo4W for develope plugin and import pb_tool get to start with qgis-designer tool also so go a had and watch this tutorial series link:https://www.youtube.com/watch?v=kZGLm2qFvtc&list=PLzHdTn7Pdxs7mMJWJnX8NQhYJlbz1t4ZF