B2B-88: add starter kit structure and elements

packages/billing/core/README.md

@@ -0,0 +1,14 @@
+# Billing - @kit/billing
+
+This package is responsible for managing billing and subscription related operations.
+
+Make sure the app installs the `@kit/billing` package before using it.
+
+```json
+{
+    "name": "my-app",
+    "dependencies": {
+        "@kit/billing": "*"
+    }
+}
+```