added iterative combination algorithm.java

[EngineerSk]

Description:

Iterative Combination Algorithm solution for finding all possible combination of k sized sub list of elements in ascending order for a given array or list of size n, where (2 <= k <= n)

Fixes #issue_number_here

Type of change:

• [x] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] This change requires a documentation update

Checklist:

• [x] My code follows the style guidelines of this project.
• [x] I have performed a self-review of my own code.
• [x] I have commented my code, particularly in hard-to-understand areas.
• [x] I have made corresponding changes to the documentation.
• [x] My changes generate no new warnings.
• [x] I have added tests that prove my fix is effective or that my feature works.
• [x] New and existing unit tests pass locally with my changes.
• [x] Any dependent changes have been merged and published in downstream modules.

Screenshots / Video: