docs: update README

README.rst

@@ -0,0 +1,17 @@
+.. code:: python
+
+  import asyncio
+  from ppgee import PPGEE
+
+
+  async def main():
+      cpf = "00011122233"
+      async with PPGEE(user=cpf, password=cpf) as ppgee:
+          response = await ppgee.frequency()
+          if "Opção não disponível" in response:
+              print("Not ready yet")
+          await asyncio.sleep(5)
+
+
+  if __name__ == "__main__":
+      asyncio.run(main())