update README

README.md

@@ -15,6 +15,27 @@ npm i crextractor
 
 ## Usage
 
+### Fetching already extracted secrets
+
+```js
+async function main() {
+  const url = 'https://raw.githubusercontent.com/vitalygashkov/crextractor/refs/heads/main/secrets.json';
+  const data = await fetch(url).then((response) => response.json());
+
+  // You can use the extracted secrets to obtain access tokens for Crunchyroll APIs
+  const response = await fetch('https://beta-api.crunchyroll.com/auth/v1/token', {
+    headers: {
+      Authorization: data.authorization,
+      // ...
+    },
+    method: 'POST',
+    body: JSON.stringify({
+      // ...
+    }),
+  });
+}
+```
+
 #### Library
 
 ```js