Add test and subject for exercise `lifetimes`

rust/tests/lifetimes_test/Cargo.lock

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

rust/tests/lifetimes_test/Cargo.toml

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+[package]
+name = "lifetimes_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]
+lifetimes = { path = "../../../../rust-piscine-solutions/lifetimes"}

rust/tests/lifetimes_test/src/main.rs

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+// Create a struct called Person that has two fields: name of type
+// string slice (&str) and age of type u8
+// and create the associated function new which creates a new person
+// with age 0 and with the name given
+
+use lifetimes::Person;
+
+fn main() {
+	let person = Person::new("Leo");
+
+	println!("Person = {:?}", person);
+}
+
+#[cfg(test)]
+mod tests {
+	use super::*;
+
+	#[test]
+	fn fields() {
+		let person = Person {
+			name: "Dijkstra",
+			age: 10,
+		};
+		assert_eq!(person.age, 10);
+		assert_eq!(person.name, "Dijkstra");
+	}
+
+	#[test]
+	fn create_person() {
+		let person = Person::new("Leo");
+		assert_eq!(person.age, 0);
+		assert_eq!(person.name, "Leo");
+	}
+}

subjects/lifetimes/README.md

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+## lifetimes
+
+### Instructions
+
+Create a struct called Person that has two fields: name of type string slice (&str) and age of type u8 and create the associated function new which creates a new person with age 0 and with the name given
+
+### Expected Functions and Data Structures
+
+```rust
+#[derive(Debug)]
+pub struct Person{
+	pub name: &str,
+	pub age: u8,
+}
+
+impl Person {
+	pub fn new(name: &str) -> Person {
+	}
+}
+```
+
+### Usage
+
+Here is a program to test your function.
+
+```rust
+fn main() {
+	let person = Person::new("Leo");
+
+	println!("Person = {:?}", person);
+}
+```
+
+And its output
+
+```console
+student@ubuntu:~/[[ROOT]]/test$ cargo run
+Person = Person { name: "Leo", age: 0 }
+student@ubuntu:~/[[ROOT]]/test$
+```