add github example

Author: nfriedly

examples/github.mjs

@@ -0,0 +1,13 @@
+import { parseRateLimit } from 'ratelimit-header-parser'
+
+const response = await fetch("https://api.github.com/repos/express-rate-limit/express-rate-limit/contributors?anon=1&per_page=100", {
+    "credentials": "omit",
+    "headers": {
+        "Accept": "application/vnd.github.v3+json",
+    },
+    "method": "GET",
+    "mode": "cors"
+});
+
+console.log( 'github ratelimit:', parseRateLimit(response) );
+// > github ratelimit: { limit: 60, used: 1, remaining: 59, reset: 2023-08-25T04:16:48.000Z }