Merge two binary Max heaps

[072arushi]

Given two binary max heaps as arrays, merge the given heaps to form a new max heap.

[github-actions]

Hello @072arushi, thanks for creating your first issue at LearnCPP, hope you followed the guidelines.

[072arushi]

Example-

Input :
n = 4 m = 3
a[] = {10, 5, 6, 2},
b[] = {12, 7, 9}
Output :
{12, 10, 9, 2, 5, 7, 6}

[072arushi]

/assign

[github-actions]

This issue has been assigned to 072arushi!
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