Add exercise `matrix_transposition`'s subject and tests

rust/tests/matrix_transposition_test/Cargo.lock

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

rust/tests/matrix_transposition_test/Cargo.toml

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

rust/tests/matrix_transposition_test/src/main.rs

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+use matrix_transposition::{transpose, Matrix};
+
+fn main() {
+	let matrix = Matrix((1, 3), (4, 5));
+	println!("Original matrix {:?}", matrix);
+	println!("Transpose matrix {:?}", transpose(matrix));
+}
+
+// #[derive(Debug)]
+// struct Matrix((i32, i32), (i32, i32));
+
+// fn transpose(m: Matrix) -> Matrix {
+// 	Matrix(((m.0).0, (m.1).0), ((m.0).1, (m.1).1))
+// }
+
+#[test]
+fn transpose_zero() {
+	let m = Matrix((0, 0), (0, 0));
+	let m = transpose(m);
+	assert_eq!(m, Matrix((0, 0), (0, 0)));
+}
+
+#[test]
+fn transpose_identity() {
+	let m = Matrix((1, 0), (0, 1));
+	let m = transpose(m);
+	assert_eq!(m, Matrix((1, 0), (0, 1)));
+}
+
+#[test]
+fn transpose_matrix() {
+	let m = Matrix((1, 3), (4, 5));
+	let m = transpose(m);
+	assert_eq!(m, Matrix((1, 4), (3, 5)));
+
+	let m = Matrix((6, 8), (1, 3));
+	let m = transpose(m);
+	assert_eq!(m, Matrix((6, 1), (8, 3)));
+}

subjects/matrix_transposition/README.md

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+## matrix_transposition
+
+### Instructions
+
+- Define the structure matrix as a tuple of tuples of `i32`'s
+
+- Define a function that calculate the transpose matrix of a 2x2 matrix.
+
+- Note:
+
+	- The transpose of a matrix `A` is the matrix `A'` where `A'`'s columns are `A`'s row and the rows are the columns:
+
+Example:
+
+```
+( a b )     __ transposition __> ( a d )
+( c d )                          ( b d )
+```
+
+- Matrix must implement Debug, PartialEq and Eq. You can use derive
+
+- Remember that you're defining a library so you have to make public the elements that are going to be called from an external crate.
+
+### Notions
+
+[Chapter 7]( https://doc.rust-lang.org/stable/book/ch07-03-paths-for-referring-to-an-item-in-the-module-tree.html )
+
+### Expected Function
+
+```rust
+pub fn transpose(m: Matrix) -> Matrix {
+}
+```
+
+### Usage
+
+Here is a posible program to test your function
+
+```rust
+fn main() {
+    let matrix = Matrix((1, 3), (4, 5));
+    println!("Original matrix {:?}", matrix);
+    println!("Transpose matrix {:?}", transpose(matrix));
+}
+```
+
+And it's output:
+
+```console
+student@ubuntu:~/[[ROOT]]/test$ cargo run
+Original matrix Matrix((1, 3), (4, 5))
+Transpose matrix Matrix((1, 4), (3, 5))
+student@ubuntu:~/[[ROOT]]/test$
+```