docs: use markdown

README.md

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+# Example:
+
+```python
+
+  import asyncio
+  import logging
+
+  from ppgee import PPGEE
+
+  logging.basicConfig(level=logging.INFO)
+
+
+  async def main() -> None:
+      cpf = "00011122233"
+      async with PPGEE(user=cpf, password=cpf) as ppgee:
+          attendency_page = await ppgee.attendency()
+          print(attendency_page.history())
+          await attendency_page.confirm()
+          await asyncio.sleep(5)
+
+
+  if __name__ == "__main__":
+      asyncio.run(main())
+```