Add resources to the project

Icons
Update README.md file
Fill plugin metadata info and fix icon path
Add Maxp help information

The help information is in a html style file.
Add About RISE section

The About section is a new dialog box with a HTML style box that
presents information about the research group.

This commit contains:
 * UI file with the details about the dialog window.
 * HTML file with the about text.
 * Modified Makefile to process the newly added about ui file.
 * Modified clusterpy_light*.py files to add the window and create it.