Added cycle_detect.cpp

[roopbiswas]

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[abranhe]

Thanks for your contribution to The All ▲lgorithms project, the huge collection of algorithms implemented in different languages.

Hi, @roopbiswas we appreciate every contribution but you will need to make some changes:

• remove count_disccount_components.cpp since it was added on #22
• Add All ▲llgorithms header
• remove selection_sort.cpp since it was added on #22

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Not approved

[abranhe]

Please fix the merge conflict with the selection_sort algorithm, since you removed the forked repository I am now able to remove it myself

[abranhe]

This PR will be closed since we already have:

• graphs/count_diconnected_components.cpp
• sorting/selection_sort.cpp

You can still open a new pull request adding cycle_detect.cpp