Improve description in README

[lars-reimann]

• Describe target audience
  • Mostly novices
• Describe approach
  • Wrap commonly-needed functionality of existing libraries
  • Offer more intuitive way to use this functionality
• Warn about current experimental status
  • Not for production usage
  • Breaking changes without further notice
  • Feedback welcome
• Installation
• Link to PyPI

[lars-reimann]

🎉 This issue has been resolved in version 0.3.0 🎉

The release is available on:

• v0.3.0
• GitHub release

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