feat: add comprehensive pressure unit conversion (#1010)

Author: AliAlimohammadi

DIRECTORY.md

@@ -85,6 +85,7 @@
     * [Octal to Decimal](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/octal_to_decimal.rs)
     * [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)
+    * [Pressure](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/pressure.rs)
     * [Rectangular to Polar](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/rectangular_to_polar.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)

src/conversions/mod.rs

@@ -13,6 +13,7 @@ mod octal_to_binary;
 mod octal_to_decimal;
 mod octal_to_hexadecimal;
 mod order_of_magnitude_conversion;
+mod pressure;
 mod rectangular_to_polar;
 mod rgb_cmyk_conversion;
 mod rgb_hsv_conversion;
@@ -38,6 +39,7 @@ pub use self::octal_to_hexadecimal::octal_to_hexadecimal;
 pub use self::order_of_magnitude_conversion::{
     convert_metric_length, metric_length_conversion, MetricLengthUnit,
 };
+pub use self::pressure::{convert_pressure, PressureUnit};
 pub use self::rectangular_to_polar::rectangular_to_polar;
 pub use self::rgb_cmyk_conversion::rgb_to_cmyk;
 pub use self::rgb_hsv_conversion::{hsv_to_rgb, rgb_to_hsv, ColorError, Hsv, Rgb};