[WCM] First Version of Documentation for SeoBundle

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | yes 
| Applies to    | https://github.com/ElectricMaxxx/CmfSeoBundle.git
| Fixed tickets | https://github.com/ElectricMaxxx/CmfSeoBundle/issues/20

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.