feat: added excercise for option

exercises/option/README.md

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+### Option
+
+#### Book Sections
+
+To learn about Option<T>, check out these links:
+
+- [Option Enum Format](https://doc.rust-lang.org/stable/book/ch10-01-syntax.html#in-enum-definitions)
+- [Option Module Documentation](https://doc.rust-lang.org/std/option/)
+- [Option Enum Documentation](https://doc.rust-lang.org/std/option/enum.Option.html)

exercises/option/option1.rs

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+//option1.rs
+//Make me compile! Execute `rustlings hint option1` for hints
+
+//I AM NOT DONE
+
+//you can modify anything EXCEPT for this function's sig
+fn print_number(maybe_number: Option<u16>) {
+    println!("printing: {}", *maybe_number);
+}
+
+fn main() {
+    print_number(13);
+    print_number(99);
+
+    let mut numbers: [Option<u16>; 5];
+    for iter in 0..5 {
+        let number_to_add: u16 = {
+            ((iter * 5) + 2) / (4 * 16);
+        };
+
+        numbers[iter] = number_to_add;
+    }
+}