Add a program for converting temperature

hottie/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "hottie"
+version = "0.1.0"

hottie/Cargo.toml

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+[package]
+name = "hottie"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

hottie/src/main.rs

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+use std::io;
+
+fn main() {
+    let mut input = String::new();
+    let celsius: bool = {
+        loop {
+            println!("Please enter the unit you wish to convert from:");
+            println!("0: Celsius");
+            println!("1: Fahrenheit");
+            io::stdin().read_line(&mut input).expect("An error occurred!");
+
+            break match input.trim().parse::<i32>() {
+                Err(_) => {
+                    println!("The specified input `{}` is invalid.", input.trim());
+                    continue;
+                },
+                Ok(value) => {
+                    value == 0
+                }
+            }
+        }
+    };
+
+    let mut input = String::new();
+    println!("Please enter the value to convert:");
+    io::stdin().read_line(&mut input).expect("An error occurred!");
+    let value: f64 = input.trim().parse().unwrap();
+
+    println!("result: {}", if celsius { value * 9.0 / 5.0 + 32.0 } else { (value - 32.0) * 5.0 / 9.0 })
+}