chore: import upstream snapshot with attribution

examples/splitwise/index.sql

@@ -0,0 +1,18 @@
+-- Simple form to create a shared expense account
+SELECT 'form' as component,
+    'New shared expense account' as title,
+    'Create the shared expense account!' as validate;
+SELECT 'Account Name' AS label,
+    'shared_expense_name' AS name;
+
+-- Insert the shared expense account posted by the form into the database
+INSERT INTO expense_group(name)
+SELECT :shared_expense_name
+WHERE :shared_expense_name IS NOT NULL;
+
+-- List of shared expense accounts
+-- (we put it after the insertion because we want to see new accounts right away when they are created)
+SELECT 'list' as component;
+SELECT name AS title,
+    'group.sql?id=' || id AS link
+FROM expense_group;