docs: some information in readme

README.md

@@ -1 +1,35 @@
-# bazaar
+# bazaar
+
+A service/library to extract product information from URLs.
+
+## Data model
+
+Currently, this information is extracted from the site (if possbile):
+
+``` js
+{
+    "image_url": "<url>", // (string) URL to an image file
+    "in_stock": false, // (bool) If the item is currently available for purchase
+    "name": "<name>", // (string) The name of the product as it appears on the site
+    "price": 14.21, // (optional, float) The price of the product [parsed by the library]
+    "price_text": "14,21 €", // (optional, string) The price of the product as it appears on the site (with currency)
+    "release_date": "2021-03-22T00:00:00Z", // (optional, string RFC3339) the release date of the item
+    "url": "<url>" // (string) The URL of the item
+}
+```
+
+## Supported sites
+
+Support is handled in a _best effort_ basis. Some sites do not provided all exposed fields.
+
+- [Amazon.es](https://amazon.es)
+- [Amazon.com](https://amazon.com)
+- [Akira Comics](https://www.akiracomics.com)
+- [Heroes De Papel](https://heroesdepapel.es)
+- [Steam](https://store.steampowered.com)
+
+## Running
+
+```
+go run cmd/server/main.go
+```