Fix issue #23: Improve tests and examples files structure

Author: Ihor Bilous

examples/suppressions.py renamed to examples/suppressions/suppressions.py

@@ -10,11 +10,19 @@ def __init__(self, client: HttpClient, account_id: str) -> None:
         self._client = client
 
     def get_list(self, email: Optional[str] = None) -> list[Suppression]:
+        """
+        List and search suppressions by email.
+        The endpoint returns up to 1000 suppressions per request.
+        """
         params = {"email": email} if email is not None else None
         response = self._client.get(self._api_path(), params=params)
         return [Suppression(**suppression) for suppression in response]
 
     def delete(self, suppression_id: str) -> Suppression:
+        """
+        Delete a suppression by ID. Mailtrap will no longer prevent
+        sending to this email unless it's recorded in suppressions again.
+        """
         response = self._client.delete(self._api_path(suppression_id))
         return Suppression(**response)