Linear Search, Swapping numbers with and without temporary variable programs

[jc-kirthi]

Hi, @pawanrajsingh2088

DSA:

1. Linear_Search.cpp

Basic:

1. Swap_without_variable.cpp
2. swap_with_temporary_variable.cpp

These programs are added.

Please review, merge and add hacktobrefest labels.

Thank you!

KIRTHI JC,
Hacktobrefest Contributor

[jc-kirthi]

@pawanrajsingh2088 please add hacktoberfest labels to the issue and the PR.