CSS Guidelines, first draft

Hello frontend,

I'm pull requesting this **very first** version of a CSS/SCSS Coding Guideline too start the discussion. Feel free to discuss, change and update the file. In the end, we should merge the result and use the Styleguide from this very moment on.

Requests of further change after this point, should be placed as pull request again and discussed that way. In this repository please use all tools github gives us, like the issue management, gists and so on.

Thx for the attention so far…
Ich wollte gerade diese doppelte Zeile löschen - aber ich kann nicht in deinen Branch commiten. Bei ZMO geht das ja problemlos. Woran liegt das, und soll das so?

> Pushing to git@github.com:codecandies/coding-guidelines.git
> ERROR: Permission to codecandies/coding-guidelines.git denied to mstoltenburg.
> fatal: Could not read from remote repository.
> Please make sure you have the correct access rights and the repository exists.