feat: Add move_semantics5 exercise.

exercises/move_semantics/move_semantics5.rs

@@ -0,0 +1,14 @@
+// move_semantics5.rs
+// Make me compile without adding any newlines or removing any of the lines.
+// Execute `rustlings hint move_semantics5` for hints :)
+
+// I AM NOT DONE
+
+fn main() {
+    let mut x = 100;
+    let y = &mut x;
+    let z = &mut *y;
+    *y += 100;
+    *z += 1000;
+    assert_eq!(x, 1200);
+}

info.toml

@@ -210,6 +210,13 @@ So the end goal is to:
    - since we're not creating a new vec in `main` anymore, we need to create
      a new vec in `fill_vec`, similarly to the way we did in `main`"""
 
+[[exercises]]
+name = "move_semantics5"
+path = "exercises/move_semantics/move_semantics5.rs"
+mode = "compile"
+hint = """Carefully reason about the range in which each mutable reference is in vogue. Does updating the value of referrent (x) immediately after the mutable reference is taken helps ? Read more about 'Mutable Referenes' in the book's section References and Borrowing': https://doc.rust-lang.org/book/ch04-02-references-and-borrowing.html#mutable-references."""
+
+
 # PRIMITIVE TYPES
 
 [[exercises]]