First Version of Documentation for SeoBundl

This would be my first version of documentation for the SeoBundle.
I do now that i need more practice in those text files, this one was my very first, but the important part for you should be to see how the bundle works at the moment. 
- Configuration
- creating a SeoAwareContent - very equal to a main content
- how does the metadata gets to the page

I do also know that my English is not as good as it should. This is the reason to call it "first version", cause i know that there will be a lot to correct.