Add the subject and test for the exercise bigger

rust/tests/bigger_test/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "bigger"
+version = "0.1.0"
+dependencies = [
+ "rand",
+]
+
+[[package]]
+name = "bigger_test"
+version = "0.1.0"
+dependencies = [
+ "bigger",
+]
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+ "cfg-if",
+ "libc",
+ "wasi",
+]
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+ "rand_core",
+ "rand_hc",
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+ "getrandom",
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+ "rand_core",
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rust/tests/bigger_test/Cargo.toml

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+[package]
+name = "bigger_test"
+version = "0.1.0"
+authors = ["MSilva95 <miguel-silva98@hotmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+bigger = { path = "../../../../rust-piscine-solutions/bigger"}

rust/tests/bigger_test/src/main.rs

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+// Create the function `bigger` that gets the biggest positive number in the `HashMap`
+
+use bigger::*;
+use std::collections::HashMap;
+
+fn main() {
+	let mut hash = HashMap::new();
+	hash.insert("Daniel", 122);
+	hash.insert("Ashley", 333);
+	hash.insert("Katie", 334);
+	hash.insert("Robert", 14);
+
+	println!(
+		"The biggest of the elements in the HashMap is {}",
+		bigger(hash)
+	);
+}
+
+#[test]
+fn test_positive() {
+	let mut f = HashMap::new();
+	f.insert("Daniel", 12);
+	f.insert("Ashley", 333);
+	f.insert("Katie", 334);
+	f.insert("Robert", 14);
+
+	assert_eq!(334, bigger(f));
+}
+
+#[test]
+fn test_negative() {
+	let mut f = HashMap::new();
+	f.insert("Daniel", 41758712);
+	f.insert("Ashley", 54551444);
+	f.insert("Katie", 575556334);
+	f.insert("Robert", 574148);
+
+	assert_eq!(575556334, bigger(f));
+}

subjects/bigger/README.md

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+## bigger
+
+### Instructions
+
+Create the function `bigger` that gets the biggest positive number in the `HashMap`.
+
+### Expected Function
+
+```rust
+fn bigger(h: HashMap<&str, i32>) -> i32 {
+}
+```
+
+### Usage
+
+Here is a program to test your function.
+
+```rust
+use bigger::bigger;
+fn main() {
+    
+    let mut hash = HashMap::new();
+    hash.insert("Daniel", 122);
+    hash.insert("Ashley", 333);
+    hash.insert("Katie", 334);
+    hash.insert("Robert", 14);
+
+    println!("The biggest of the elements in the HashMap is {}", bigger(hash));
+}
+```
+
+And its output
+
+```console
+student@ubuntu:~/[[ROOT]]/test$ cargo run
+Is `thought` a permutation of `thougth`? = true
+student@ubuntu:~/[[ROOT]]/test$
+```