Added Solution

Author: niranjana687

Diff for: tutorials/learnRust.org/Hello World!.md

@@ -37,4 +37,10 @@ Tutorial Code
 Expected Output
 ---------------
 
-    Covid19 made me do this.
+    Covid19 made me do this.
+
+Solution
+--------
+    fn main() {
+        println!("Covid19 made me do this.");
+    }