Depth first search cpp

[SaRTHaK0909k]

Is your feature request related to a problem? Please describe.
It will be code to perform dfs on trees and graphs

Please assign me this issue under tag hacktoberfest :)

[HimanshuMahto]

hey can you assign this problem to me please.

[Babuprasanth27]

Hey, I am interested to fix this issue. would you please assign to me

[Kishan31082003]

assign please

[Nandinig24]

@SaRTHaK0909k Please assign the task to me