README.md: Added how to download.

Also updated description.
Merge branch 'development'

First version released with one script example.
Merge branch 'development'

Added more scripts. Divided into method subdirectories.
Added contribute section.
Update README.md

Removed spaces in e-mail.
Wrote about dependencies.
Corrected typo.
Added X11 flags.
Release: Merge branch 'development'

Released package with scripts for CrankNicolson and ForwardEuler schemes.
Added section about download zip.
Corrected typo in course code.
Fixed run command in docstring.
Fixed run command in docstring.
Fixed run command in docstring.
Fixed run command in docstring.
Merge branch 'master' into development