feat: rgb_cmyk_conversion

[ali77gh]

RGB to CMYK conversion

Description

RGB to CMYK Color format algorithm is implemented.

Type of change

• [x] New feature (non-breaking change which adds functionality)

Checklist:

• [x] I ran bellow commands using the latest version of rust nightly.
• [x] I ran cargo clippy --all -- -D warnings just before my last commit and fixed any issue that was found.
• [x] I ran cargo fmt just before my last commit.
• [x] I ran cargo test just before my last commit and all tests passed.
• [x] I added my algorithm to the corresponding mod.rs file within its own folder, and in any parent folder(s).
• [x] I added my algorithm to DIRECTORY.md with the correct link.
• [x] I checked COUNTRIBUTING.md and my code follows its guidelines.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.42%. Comparing base (c906255) to head (efbe4af).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #831 +/- ## ======================================= Coverage 95.41% 95.42% ======================================= Files 314 315 +1 Lines 22783 22806 +23 ======================================= + Hits 21739 21762 +23 Misses 1044 1044 ```

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[ali77gh]

Ops! CI failed. I will make another commit to fix it ASAP.