Create pancake_sort.py in algorithms/sort

[9967han]

(Put an X inside the [ ] to denote check mark [X].)

• [ X ] If creating a new file :

  • [ X ] added links to it in the README files ?
  • [ X ] included tests with it ?
  • [ X ] added description (overview of algorithm, time and space compleixty, and possible edge case) in docstrings ?

• if done some changes :

  • wrote short description in the PR explaining what the changes do ?
  • Fixes #[issue number] if related to any issue

• other

[coveralls]

Pull Request Test Coverage Report for Build 556

• 0 of 11 (0.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.1%) to 69.166%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
algorithms/sort/pancake_sort.py	0	11	0.0%

Files with Coverage Reduction	New Missed Lines	%
algorithms/linkedlist/is_palindrome.py	1	93.33%

Totals
Change from base Build 555:	-0.1%
Covered Lines:	3210
Relevant Lines:	4641

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💛 - Coveralls