feat: add RGB/HSV color conversion

DIRECTORY.md

@@ -83,6 +83,7 @@
     * [Octal to Hexadecimal](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/octal_to_hexadecimal.rs)
     * [Order of Magnitude Conversion](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/order_of_magnitude_conversion.rs)
     * [RGB-CMYK Conversion](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/rgb_cmyk_conversion.rs)
+    * [RGB-HSV Conversion](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/rgb_hsv_conversion.rs)
     * [Roman Numerals](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/roman_numerals.rs)
   * Data Structures
     * [AVL Tree](https://github.com/TheAlgorithms/Rust/blob/master/src/data_structures/avl_tree.rs)

src/conversions/mod.rs

@@ -13,6 +13,7 @@ mod octal_to_decimal;
 mod octal_to_hexadecimal;
 mod order_of_magnitude_conversion;
 mod rgb_cmyk_conversion;
+mod rgb_hsv_conversion;
 mod roman_numerals;
 
 pub use self::binary_to_decimal::binary_to_decimal;
@@ -32,4 +33,5 @@ pub use self::order_of_magnitude_conversion::{
     convert_metric_length, metric_length_conversion, MetricLengthUnit,
 };
 pub use self::rgb_cmyk_conversion::rgb_to_cmyk;
+pub use self::rgb_hsv_conversion::{hsv_to_rgb, rgb_to_hsv, ColorError, Hsv, Rgb};
 pub use self::roman_numerals::{int_to_roman, roman_to_int};