Updating
Update README.md
adding my introductory slides
Update README.md
First PS_Fourier Notebook, some changes still required
Updated version of Pseudospectral method 1D code
Merge pull request #1 from flo-woelfl/master

PS Fourier 1D ipynb
Merge pull request #2 from fablindner/master

Slides to the Pseudospectral Fourier Method
Update README.md
Merge pull request #3 from fablindner/master

corrected version
added Pseudospectral Chebychev
first attempt

Signed-off-by: Heiner Igel <heiner.igel@lmu.de>