Add Smiles and a test

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: thomasrockhu-codecov

app/smiles.py

@@ -0,0 +1,3 @@
+class Smiles:
+    def smile():
+        return ":)"

app/test_smiles.py

@@ -0,0 +1,5 @@
+from .smiles import Smiles
+
+
+def test_smile():
+    assert Smiles.smile() == ":)"