wip: add db classes; can't load SQLite driver.

apps/vdb-backend/res/credentials.template.json

@@ -0,0 +1,11 @@
+{
+  "installed": {
+    "client_id": "",
+    "project_id": "",
+    "auth_uri": "https://accounts.google.com/o/oauth2/auth",
+    "token_uri": "https://oauth2.googleapis.com/token",
+    "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
+    "client_secret": "",
+    "redirect_uris": ["http://localhost"]
+  }
+}

apps/vdb-backend/res/token.template.json

@@ -0,0 +1,6 @@
+{
+	"type": "authorized_user",
+	"client_id": "",
+	"client_secret": "",
+	"refresh_token": ""
+}