implementation of max heap in c++

[Shr03mink]

creating a max heap using upadjustment

[xlogix]

Please assign your PR to an existing issue or raise a new one.

[maverickLez-zz]

Will this repo will be considered under Hacktoberfest 2020, as according to their guidelines issues should be labelled as "hacktoberfest-accepted" OR repo should under hacktoberfest topic, none of the conditions is prevailing here?