feat: criar estrutura inicial do projeto com app.py e pyproject.toml

app.py

@@ -0,0 +1,6 @@
+def main():
+    print("Hello from reference-extractor!")
+
+
+if __name__ == "__main__":
+    main()

pyproject.toml

@@ -0,0 +1,7 @@
+[project]
+name = "reference-extractor"
+version = "0.1.0"
+description = "Add your description here"
+readme = "README.md"
+requires-python = ">=3.12"
+dependencies = []