docs(min_and_max): add new rust exam exercise

subjects/min_and_max/README.md

@@ -0,0 +1,45 @@
+## min_and_max
+
+### Instructions
+
+Create a **function** named `min_and_max` that receives three `i32` and returns a `tuple` with the minimum and the maximum number received as input.
+
+```rust
+pub fn min_and_max(nb_1: i32, nb_2: i32, nb_3: i32) -> (i32, i32) {
+}
+```
+
+### Usage
+
+Here is a program to test your function
+
+```rust
+use min_and_max::min_and_max;
+
+fn main() {
+    let nb_1 = 9;
+    let nb_2 = 4;
+    let nb_3 = 2;
+    let (min, max) = min_and_max(nb_1, nb_2, nb_3);
+    println!(
+        "The minimum is {}, the maximum is {}",
+        min, max
+    );
+}
+```
+
+And its output
+
+```console
+$ cargo run
+The minimum is 2, the maximum is 9
+$
+```
+
+### Notions
+
+- [The Tuple Type](https://doc.rust-lang.org/stable/book/ch03-02-data-types.html?highlight=accessing%20a%20tuple#compound-types)
+
+- [Tuples](https://doc.rust-lang.org/rust-by-example/primitives/tuples.html)
+
+- [Tuple Structs without Named Fields](https://doc.rust-lang.org/stable/book/ch05-01-defining-structs.html?highlight=tuple#using-tuple-structs-without-named-fields-to-create-different-types)