doc: Expand README.md
The readme file should include the following sections:
- Features – list-style but comprehensible description of the provided features of this project
- Getting started –
- Example – Short code block (~25 loc) demonstrating the main features of the framework. May be part of the Getting Started (no individual heading)
- References to further resources (examples)
- Project Structure – Short overview over the included packages and modules (only those wihtin the
aas
package). This may be merged somehow with the Features section
- Contributing
- Information about our codestyle and testing
- Information about how to contribute Code/patches