Update README.md

Adding some more information and a short installation tutorial.
Update README.md
Update README.md

correct markup syntax now
Update README.md
German language files added
README.md files for each module added
Updated "Project-Id-Version: odoo-vertical-community\n"
small spelling correction
Signed-off-by: Lucas Huber <lucas.huber@org-it.ch>
Merge pull request #8 from jeema-solutions/8.0

[Unreviewed]README.md and German translations