Add Cloudflare Workers configuration

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

.gitignore

@@ -24,4 +24,10 @@ dist
 
 npm-debug.log*
 yarn-debug.log*
-yarn-error.log*
+yarn-error.log*
+
+# wrangler files
+.wrangler
+.dev.vars*
+!.dev.vars.example
+!.env.example