added stub of google vendor

tatt/vendors/google.py

@@ -0,0 +1,48 @@
+from .vendor import TranscriberBaseClass
+
+
+class Transcriber(TranscriberBaseClass):
+
+    no_config_error_message = (
+            'Please sign up for the Google Speech-to-Text API, get credentials, '
+            'and put the path to your credentials (private key) in an '
+            'environment variable "GOOGLE_STT_PRIVATE_KEY_PATH"'
+            )
+
+    def __init__(self, filepath):
+        super().__init__(filepath)
+
+    @classmethod
+    def _setup(cls):
+        if not cls.check_for_config():
+            raise exceptions.ConfigError(cls.no_config_error_message)
+
+    @staticmethod
+    @abc.abstractmethod
+    def check_for_config() -> bool:
+        os.getenv('GOOGLE_STT_PRIVATE_KEY_PATH') is not None
+
+    @abc.abstractmethod
+    def transcribe(self) -> str:
+        """
+        This should do any required logic, 
+        then call self._request_transcription.
+        It should return the job_name.
+        """
+        pass
+
+    @abc.abstractmethod
+    def _request_transcription(self) -> str:
+        """Returns the job_name"""
+        pass
+
+    @classmethod
+    @abc.abstractmethod
+    def retrieve_transcript(transcription_job_name: str) -> dict:
+        pass
+
+    @classmethod
+    @abc.abstractmethod
+    def get_transcription_jobs():
+        pass
+