Add Cloudflare Workers configuration

Author: cloudflare-workers-and-pages[bot]

.gitignore

@@ -20,3 +20,9 @@
 npm-debug.log*
 yarn-debug.log*
 yarn-error.log*
+
+# wrangler files
+.wrangler
+.dev.vars*
+!.dev.vars.example
+!.env.example