Adding a pictures to the description GitHub

[NeoRider7]

It is advisable to add a pictures in README on GitHub here: https://github.com/provector/jPBCE

What pictures need to be added:

1. Title picture https://staticdelivery.nexusmods.com/images/1336/80696578-1583507174.jpg

2. Select Challenge picture https://user-images.githubusercontent.com/12935423/73568657-c4f28a00-4460-11ea-82b3-f03e56665bd7.png

[provector]

Once a fully tested version is released Ill update all the pics and documentation. As for now there are plans regarding workshop integration its possible the ui will still change a bit.