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Add permutations/combinations cheat sheets.
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‎src/algorithms/sets/combinations/README.md‎

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choose `r` of them. Repetition allowed,
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order doesn't matter.
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## Cheat Sheets
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Permutations cheat sheet
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![Permutations Cheat Sheet](https://cdn-images-1.medium.com/max/2000/1*JNK-n0Pt0Vbxk0lxVpgT5A.png)
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Combinations cheat sheet
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![Combinations Cheat Sheet](https://cdn-images-1.medium.com/max/2000/1*7cFRn8jW4g_91YgDAbmxRQ.png)
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Permutations/combinations algorithm ideas.
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![Algorithms Idea](https://cdn-images-1.medium.com/max/2000/1*vLsSsZMnesCFPCYTYMbxrQ.png)
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## References
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[Math Is Fun](https://www.mathsisfun.com/combinatorics/combinations-permutations.html)
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- [Math Is Fun](https://www.mathsisfun.com/combinatorics/combinations-permutations.html)
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- [Permutations/combinations cheat sheets](https://medium.com/@trekhleb/permutations-combinations-algorithms-cheat-sheet-68c14879aba5)

‎src/algorithms/sets/permutations/README.md‎

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n * n * n ... (r times) = n^r
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```
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## Cheat Sheets
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Permutations cheat sheet
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![Permutations Cheat Sheet](https://cdn-images-1.medium.com/max/2000/1*JNK-n0Pt0Vbxk0lxVpgT5A.png)
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Combinations cheat sheet
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![Combinations Cheat Sheet](https://cdn-images-1.medium.com/max/2000/1*7cFRn8jW4g_91YgDAbmxRQ.png)
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Permutations/combinations algorithm ideas.
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![Algorithms Idea](https://cdn-images-1.medium.com/max/2000/1*vLsSsZMnesCFPCYTYMbxrQ.png)
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## References
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[Math Is Fun](https://www.mathsisfun.com/combinatorics/combinations-permutations.html)
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- [Math Is Fun](https://www.mathsisfun.com/combinatorics/combinations-permutations.html)
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- [Permutations/combinations cheat sheets](https://medium.com/@trekhleb/permutations-combinations-algorithms-cheat-sheet-68c14879aba5)

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