Add get all templates schema

app/v2/template_schema.py

@@ -0,0 +1,15 @@
+from app.schema_validation.definitions import uuid
+
+# this may belong in a templates module
+template = {
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "description": "template schema",
+    "type": "object",
+    "title": "notification content",
+    "properties": {
+        "id": uuid,
+        "version": {"type": "integer"},
+        "uri": {"type": "string", "format": "uri"}
+    },
+    "required": ["id", "version", "uri"]
+}