Add slides

Adding the folders for my slides, LICENSE, README files and the avalanche theme

new file:	./.gitignore
new file:	./.gitmodules
new file:	./LICENSE.md
new file:	./README.md
new file:   slides/cc-by-sa.png
new file:	slides/LICENSE.md
new file:	slides/presentation/notes.md
new file:	slides/presentation/presentation.cfg
new file:	slides/presentation/slides.md
sub-module:	slides/theme/avalanche