feat: Added exercises/enums

Added 3 new exercises for enums, enums{1-3}.rs

exercises/enums/README.md

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+For this exercise check out the sections:
+- [Defining an Enum](https://doc.rust-lang.org/book/ch06-01-defining-an-enum.html) 
+
+of the Rust Book.

exercises/enums/enums1.rs

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+// enums1.rs
+// Make me compile by adding my favorite fruit in the enum definition :)
+// Hints can be found below
+
+#[derive(Debug)]
+enum Fruit {
+    Banana,
+    Apple,
+    Pear,
+    // Add another fruit here
+}
+
+fn main() {
+    println!("The writer likes like {:#?}", Fruit::Mango);
+}
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+// Look at the syntax of how the fruit is being printed to figure out what to
+// add to the enum.  (HINT: I really like Mangos)

exercises/enums/enums2.rs

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+// enums2.rs
+// Make me compile by putting your favorite fruit in the print statement :)
+// Hints can be found below
+
+// For extra challenge add your favorite fruit to the enum and print that :) 
+
+#[derive(Debug)]
+enum Fruit {
+    Banana,
+    Apple,
+    Pear,
+    Mango
+}
+
+fn main() {
+    // Assign this variable to your favorite fruit
+    // let fruit = ???;
+    println!("I like {:#?}", favorite);
+}
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+// Rust uses a certain sytax for getting a particular value from an enum. You
+// can find enums in the "Enums and Pattern Matching" section of the Rust Book,
+// starting on page 113

exercises/enums/enums3.rs

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+// enums3.rs
+// Try making an enum to immitate these structs
+
+// Tuple Struct
+struct FruitBasketRecipient(String);
+
+// Classic Struct
+struct FruitBasketSize {
+    depth: i32,
+    width: i32,
+}
+
+// Unit Struct
+struct FruitBasketEmpty;
+
+// Complete this definition so the file compiles
+#[derive(Debug)]
+enum FruitBasket {
+}
+
+fn main() {
+    // These do not need to be touched :) but the file will not compile if the
+    // elements of the enum have not been defines
+    let recipient = FruitBasket::Recipient(String::from("John Doe"));
+    println!("The fruit basket says: {:#?}", recipient);
+
+    let size = FruitBasket::Size{depth:3, width:4};
+    println!("The manual for the fruit basket says: {:#?}", size);
+
+    let is_empty = FruitBasket::Empty;
+}
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+// Rust can store many different types of values in an enum, check out the 
+// 'Enum Values' Subsection of the Enum chapter for more info

info.toml

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 path = "exercises/test3.rs"
 mode = "compile"
 
+# ENUMS
+
+[[exercises]]
+path = "exercises/enums/enums1.rs"
+mode = "compile"
+
+[[exercises]]
+path = "exercises/enums/enums2.rs"
+mode = "compile"
+
+[[exercises]]
+path = "exercises/enums/enums3.rs"
+mode = "compile"
+
 # MODULES
 
 [[exercises]]