Initialize catalog structure and product schema

README.md

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+# RoundCount Catalog
+
+RoundCount Catalog is a machine-readable ammunition product database for the RoundCount inventory system.
+
+The catalog stores reusable product information such as:
+
+- UPC
+- Manufacturer SKU
+- Manufacturer
+- Brand
+- Product name
+- Caliber
+- Bullet weight and type
+- Case material
+- Package quantity
+- Ballistic information
+- Product images
+- Source and verification information
+
+Personal inventory information such as quantities, purchase prices, storage locations, and lot numbers does not belong in this repository.
+
+## Repository Structure
+
+```text
+schema/
+    JSON schemas used to validate catalog records
+
+catalog/
+    Individual ammunition product records
+
+images/
+    Product images organized by manufacturer
+
+indexes/
+    Generated UPC, SKU, and manufacturer indexes
+
+exports/
+    Generated combined catalog downloads
+
+docs/
+    Catalog documentation and contribution guides
+
+tools/
+    Validation, indexing, and export scripts
+EFO