first commit

exercises/01_variables/variables2.rs

@@ -0,0 +1,10 @@
+fn main() {
+    // TODO: Change the line below to fix the compiler error.
+    let x;
+
+    if x == 10 {
+        println!("x is ten!");
+    } else {
+        println!("x is not ten!");
+    }
+}