docs: add an example how to create a task

[bednar]

Proposed Changes

Added an example how to create a task by API.

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• pytest tests completes successfully
• Commit messages are in semantic format
• Sign CLA (if not already signed)

[codecov-commenter]

Codecov Report

Merging #395 (8110029) into master (86c2d62) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #395   +/-   ##
=======================================
  Coverage   92.95%   92.95%           
=======================================
  Files          28       28           
  Lines        2400     2400           
=======================================
  Hits         2231     2231           
  Misses        169      169           

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