Add exercise temperature_conv

rust/tests/temperature_conv_test/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "temperature_conv"
+version = "0.1.0"
+
+[[package]]
+name = "temperature_conv_test"
+version = "0.1.0"
+dependencies = [
+ "temperature_conv",
+]

rust/tests/temperature_conv_test/Cargo.toml

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+[package]
+name = "temperature_conv_test"
+version = "0.1.0"
+authors = ["Augusto <aug.ornelas@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+temperature_conv = { path = "../../../../rust-piscine-solutions/temperature_conv"}

rust/tests/temperature_conv_test/src/main.rs

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+use temperature_conv::*;
+
+use std::f64::EPSILON;
+
+fn eql(a: f64, b: f64) -> bool {
+	(b - a).abs() < EPSILON
+}
+
+#[test]
+fn test_f_to_c() {
+	println!("{}", fahrenheit_to_celsius(83.0));
+	assert!(eql(fahrenheit_to_celsius(20.0), -6.666666666666666));
+	assert!(eql(fahrenheit_to_celsius(83.0), 28.333333333333332));
+}
+
+#[test]
+fn test_c_to_f() {
+	assert!(eql(celsius_to_fahrenheit(27.0), 80.6));
+	assert!(eql(celsius_to_fahrenheit(0.0), 32.0))
+}

subjects/temperature_conv/README.md

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+## temperature_conv
+
+### Instructions
+
+Write two functions to transform values of temperatures from celcius to fahrenheit and the other way arraound:
+
+### Expected funcions
+
+```rust
+fn fahrenheit_to_celsius(f: f64) -> f64 {
+}
+
+fn celsius_to_fahrenheit(c: f64) -> f64 {
+}
+```
+
+### Usage
+
+```rust
+use temperature_conv::*;
+
+
+fn main() {
+	println!("{} F = {} C", -459.67, fahrenheit_to_celsius(-459.67));
+	println!("{} C = {} F", 0.0, celsius_to_fahrenheit(0.0));
+}
+```