Read.me file and GitHub pages

[fabianhalbig]

Required changes for cleaning up the git hub:

• [x] create folder for presentation slides and one-minute pitch
• [x] add read.me file for repository description
• [x] update the sidebar of the wiki
• [x] update BMC picture in confulence
• [x] add BMC to presentation slides

Check details about requirements here.

[se-seidel]

All requirements fulfilled