Add description for problem 0001
Add solution for problem 0001 in Haskell
Add solution for problem 0001 in Python3
Add description for problem 0002
Add solution for problem 0002 in Python3
Add description for problem 0003
Add solution for problem 0003 in Python3
Merge branch 'problem-0001'
Merge branch 'problem-0002'
Merge branch 'problem-0003'