Adding beginning of _MLKitService (#323)

* Adding beginning of _MLKitService

* Added License and Docstring

Author: ifielker

firebase_admin/mlkit.py

@@ -0,0 +1,25 @@
+# Copyright 2019 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Firebase ML Kit module.
+
+This module contains functions for creating, updating, getting, listing,
+deleting, publishing and unpublishing Firebase ML Kit models.
+"""
+
+class _MLKitService(object):
+    """Firebase MLKit service."""
+
+    BASE_URL = 'https://mlkit.googleapis.com'
+    PROJECT_URL = 'https://mlkit.googleapis.com/projects/{0}/'