Add documentation for Linear Search

[ekdnam]

Linear search is an algorithm which is used to efficiently search an array of objects.

Add the documentation for the algorithm.

It should be in /Searching/Linear Search/README.md

Happy Open-Sourcing!

For your reference: Wikipedia

[amitShindeGit]

Hey ekdnam,could you please assign this to me.I am willing to do this.

[akshitkumar450]

i would like to do it..please assign this to me.

[ekdnam]

We are not assigning anyone here right now! Go ahead make a PR!

[NidhiNivedita6]

Please assign this to me.

[amitShindeGit]

Okay.

[Mayankjha997]

Please assign this to me. I will do this

[ekdnam]

We are not assigning anyone here right now! Go ahead make a PR!

[ekdnam]

As it has been solved, closing the issue