Add the subject and test of `string_permutation`

rust/tests/string_permutation_test/Cargo.lock

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

rust/tests/string_permutation_test/Cargo.toml

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

rust/tests/string_permutation_test/src/main.rs

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+// Define the function `is_permutation` that returns true if the
+// string `s1` is a permutation of `s2`, otherwise it returns false
+// `s1` is a permutation of `s2` if all the elements in `s1` appear the
+// same number of times in `s2` and all the characters in `s1` appear in
+// `s2` even if in different order)
+use string_permutation::*;
+
+#[allow(dead_code)]
+fn main() {
+	let word = "thought";
+	let word1 = "thougth";
+	println!(
+		"Is `{}` a permutation of `{}`? = {}",
+		word,
+		word1,
+		is_permutation(word, word1)
+	);
+}
+
+#[test]
+fn permutation_ascii() {
+	assert!(is_permutation("abcde", "edbca"));
+	assert!(!is_permutation("avcde", "edbca"));
+	assert!(!is_permutation("cde", "edbca"));
+	assert!(is_permutation("code", "deco"));
+	assert!(!is_permutation("code", "deeco"));
+	assert!(!is_permutation("codde", "deeco"));
+}
+
+#[test]
+fn permutation_unicode() {
+	assert!(is_permutation("hello♥", "♥oelhl"));
+	assert!(!is_permutation("♥", "♥♥"));
+}

subjects/string_permutation/README.md

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+## string_permutation
+
+### Instructions
+
+Define the function `is_permutation` that returns true if the string `s1` is a permutation of `s2`, otherwise it returns false `s1` is a permutation of `s2` if all the elements in `s1` appear the same number of times in `s2` and all the characters in `s1` appear in `s2` even if in different order)
+
+### Expected Function
+
+```rust
+fn is_permutation(s1: &str, s2: &str) -> bool {
+}
+```
+
+### Usage
+
+Here is a program to test your function.
+
+```rust
+fn main() {
+	let word = "thought";
+	let word1 = "thougth";
+	println!(
+		"Is `{}` a permutation of `{}`? = {}",
+		word,
+		word1,
+		is_permutation(word, word1)
+	);
+}
+```
+
+And its output
+
+```console
+student@ubuntu:~/[[ROOT]]/test$ cargo run
+Is `thought` a permutation of `thougth`? = true
+student@ubuntu:~/[[ROOT]]/test$
+```