One-line summary
Description (what it is). Background, terms, and abstractions.
Why I do this project?
Perhaps this project is a reflection of some idea or philosophy.
Common usage case of this project in a short snippet.
It shouldn't contain all the features of the project.
Short is better than full.
Architect, conceptions, dependencies. This section should be written after implementation.
List of features that may help to decide use this project.
List of inspiration projects, alternatives, and analogs. Maybe some comparisons if it's important.
Features to do.