Improve in-tree documentation

Description

Improve the contents of in-tree documentation:

  1. main README.md: currently contain developer-oriented content, should contain instead an overview of the project, where to download, where to find documentation, and a 5-minutes tutorial.

  2. CONTRIBUTING.md: include guidelines for contributing code (branching model, code formatting, etc.);

  3. Other README files: improve contents with module descriptions.

Environment

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Reporter

Tomasz Lelek

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