Add 'Debug simple typo with guidance' challenge (#65)

Signed-off-by: Merwane Hamadi <merwanehamadi@gmail.com>

agbenchmark/tests/basic_abilities/write_file/w_file_data.json

@@ -7,7 +7,8 @@
     "answer": "Washington",
     "should_contain": ["Washington"],
     "should_not_contain": ["New York", "Los Angeles", "San Francisco"],
-    "files": [".txt"]
+    "files": [".txt"],
+    "type": "file"
   },
   "mock": {
     "mock_func": "basic_write_file_mock",

agbenchmark/tests/basic_abilities/write_file/write_file_test.py

@@ -16,7 +16,9 @@ class TestWriteFile(BasicChallenge):
     def test_method(self, config: Dict[str, Any]) -> None:
         self.setup_challenge(config)
 
-        files_contents = self.open_files(config["workspace"], self.data.ground.files)
+        files_contents = self.get_artifacts_out(
+            config["workspace"], self.data.ground.files
+        )
 
         scores = []
         for file_content in files_contents: