Improve documentation

[micaeljtoliveira]

• Add link to manual in Readme.
• Add information about how to use scopes to reduce repetition.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.85%. Comparing base (8e6406f) to head (9f8a098).

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #5   +/-   ##
=======================================
  Coverage   99.85%   99.85%           
=======================================
  Files          13       13           
  Lines         698      698           
=======================================
  Hits          697      697           
  Misses          1        1           

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