feat: add basic "create order" feature, docs, tests

just the package API docs so far, narrative will come later

tests/db/model/batch/test_neworder.py

@@ -0,0 +1,23 @@
+# -*- coding: utf-8; -*-
+
+from wuttjamaican.testing import DataTestCase
+
+from sideshow.db.model.batch import neworder as mod
+from sideshow.db.model.products import PendingProduct
+
+
+class TestNewOrderBatchRow(DataTestCase):
+
+    def test_str(self):
+
+        row = mod.NewOrderBatchRow()
+        self.assertEqual(str(row), "")
+
+        row = mod.NewOrderBatchRow(product_description="Vinegar")
+        self.assertEqual(str(row), "Vinegar")
+
+        product = PendingProduct(brand_name="Bragg",
+                                 description="Vinegar",
+                                 size="32oz")
+        row = mod.NewOrderBatchRow(pending_product=product)
+        self.assertEqual(str(row), "Bragg Vinegar 32oz")