Add subject and test of the exercise `closures`

rust/tests/closures_test/Cargo.lock

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

rust/tests/closures_test/Cargo.toml

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

rust/tests/closures_test/src/main.rs

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+// Using closures and iterators create a function,
+// first_fifty_even_square() that returns the
+// first 50 pair numbers squares that it's [4, 16, 36, ..., 10000].
+
+use closures::*;
+
+fn main() {
+	println!("Hello, world!");
+	let v1 = first_fifty_even_square();
+
+	println!("All elements in {:?}, len = {}", v1, v1.len());
+}
+
+#[cfg(test)]
+mod tests {
+	use super::*;
+
+	#[test]
+	fn test() {
+		let v1 = vec![
+			4, 16, 36, 64, 100, 144, 196, 256, 324, 400, 484, 576, 676, 784, 900, 1024, 1156, 1296,
+			1444, 1600, 1764, 1936, 2116, 2304, 2500, 2704, 2916, 3136, 3364, 3600, 3844, 4096,
+			4356, 4624, 4900, 5184, 5476, 5776, 6084, 6400, 6724, 7056, 7396, 7744, 8100, 8464,
+			8836, 9216, 9604, 10000,
+		];
+		assert_eq!(v1, first_fifty_even_square());
+	}
+}

subjects/closures/README.md

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+## closures
+
+### Instructions
+
+Using closures and iterators create a function, `first_fifty_even_square` that returns the first 50
+
+### Expected Functions
+
+```rust
+fn first_fifty_even_square() -> Vec<i32> {
+}
+```
+
+### Usage
+
+Here is a program to test your function.
+
+```rust
+fn main() {
+	println!("Hello, world!");
+	let v1 = first_fifty_even_square();
+
+	println!("All elements in {:?}, len = {}", v1, v1.len());
+}
+```
+
+And its output
+
+```console
+student@ubuntu:~/[[ROOT]]/test$ cargo run
+All elements in [4, 16, 36, ..., 10000], len = 50
+student@ubuntu:~/[[ROOT]]/test$
+```