Add Cloudflare Workers configuration

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

.gitignore

@@ -23,4 +23,10 @@ dist-ssr
 *.sln
 *.sw?
 
-.env
+.env
+
+# wrangler files
+.wrangler
+.dev.vars*
+!.dev.vars.example
+!.env.example