The sum of outcomes for rolling an N-sided dice K times.

[dipuk0506]

Describe your change:

• Add an algorithm?

  The sum of outcomes for rolling an N-sided dice K times.

  This function returns a list. The first element is an array.
  That array contains indexes.
  The second element is another array.
  That array contains probabilities for getting each index values
  as the sum of obtained side values.

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new Python files are placed inside an existing directory.
• All filenames are in all lowercase characters with no spaces or dashes.
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• All functions have doctests that pass the automated testing.
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• If this pull request resolves one or more open issues then the description above includes the issue number(s) with a closing keyword: "Fixes #ISSUE-NUMBER".