Adding Linear Search algorithm in C++ about hacktoberfest2022

[github-actions]

@anishhh238 Please Star ⭐️ the repo to earn "hacktober-accepted" label for the event.
Meanwhile if you want to work on this issue, Please raise the PR and we will review and merge it.

[anishhh238]

I raised a PR n Stared it
Please merge the PR So I can increase my Hacksquad score

[Asrani-Aman]

please assign this task to me

[inbuilt-aura]

hello,if this is open, plzz assign me, i would be very grateful

[Faiq0602]

Hello , please assign this to me because i think i can do it in minimum amount of time as it is related to linear search

[Sanskrutiii]

Hello sir, can you assign this issue to me?

[Kp-cloud371]

Please assigned this issue to me