Length conversion

[ali77gh]

Length Conversions

Description

Algorithm of converting different length units together.

Something like python repo

Available Units:

• Millimeter
• Centimeter
• Meter
• Kilometer
• Inch
• Foot
• Yard
• Mile

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 95.41%. Comparing base (1af4efa) to head (967f112).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #830 +/- ## ========================================== + Coverage 95.35% 95.41% +0.05% ========================================== Files 313 314 +1 Lines 22708 22754 +46 ========================================== + Hits 21654 21710 +56 + Misses 1054 1044 -10 ```

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