task 01
Add solution and full tests for challenge 01
Update the description of task 1.
challenge 02
Fix harmonic number formula
Merge pull request #7 from gtqnchev/fix-harmonic-series

Fix harmonic number formula
challenge 02: update README
Fix typo in challenge 01
add editors docs in README
Merge pull request #8 from mdimitrova/challenge01-fix-typo

Fix typo in challenge 01
Merge with upstream