docs: add TODO in cookiecutter template

Author: wislertt

.templates/leetcode/{{cookiecutter.problem_name}}/solution.py

@@ -4,9 +4,9 @@ class {{cookiecutter.solution_class_name}}:
     {%- for _, methods in cookiecutter._solution_methods | dictsort %}
     {%- for method in methods %}
     # Time: O(?)
-    # Space: O(?)
+    # Space: O(?){# TODO: add decorator // optional self. #}
     def {{method.name}}(self, {{method.parameters}}) -> {{method.return_type}}:
-        # TODO: Implement {{method.name}}
+        # TODO: Implement {{method.name}}{# TODO: add body #}
         return {{method.dummy_return}}
 
     {%- endfor %}

.templates/leetcode/{{cookiecutter.problem_name}}/tests.py

@@ -3,7 +3,7 @@
 
 class Test{{cookiecutter.test_class_name}}:
     {%- for _, helper_methods in cookiecutter._test_helper_methods | dictsort %}
-    {%- for method in helper_methods %}
+    {%- for method in helper_methods %}{# TODO: add decorator // optional self. #}
     def {{method.name}}(self{% if method.parameters %}, {{method.parameters}}{% endif %}):
         {{method.body | indent(8, first=False)}}