Added free_sms_fragment_limit model, schema, dao and Rest

app/billing/billing_schemas.py

@@ -0,0 +1,14 @@
+from app.schema_validation.definitions import uuid, https_url
+
+
+create_or_update_free_sms_fragment_limit_schema = {
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "description": "POST annual billing schema",
+    "type": "object",
+    "title": "Create",
+    "properties": {
+        "free_sms_fragment_limit": {"type": "integer", "minimum": 1},
+        "financial_year_start": {"type": "integer", "minimum": 1}
+    },
+    "required": ["free_sms_fragment_limit", "financial_year_start"]
+}