Added Linear Search

[BalestraPatrick]

Hey! I added a basic example of linear search with a written explanation.
Please let me know if anything else is required 😀

[hollance]

Hey, this looks great!

I have two requests:

1. Could you rename the folder "Linear Search" with a space? That's more consistent with the naming of the other folders.
2. Could you add your name to the readme? Something like "by My Name" at the top. That way you get some credit for your work. :-)

Thanks!

[BalestraPatrick]

Done and fixed the merge conflicts! Should be ready to be merged 👍

[hollance]

FYI: I moved your name to the Linear Search document itself, plus tweaked the code slightly. Thanks again for contributing! :-)