chore(route-convention): update readme (#8)

Author: mcansh

packages/v1-route-convention/README.md

@@ -4,5 +4,22 @@
 // remix.config.js
 const { createRoutesFromFolders } = require("@remix-run/v1-route-convention");
 
+// tell Remix to ignore everything in the routes directory 
+// we'll let `createRoutesFromFolders` take care of that
+exports.ignoredRouteFiles = ["**/*"];
 exports.routes = (defineRoutes) => createRoutesFromFolders(defineRoutes);
 ```
+
+> **Note**
+> If you're already using `ignoredRouteFiles` you can move that to the plugin to keep using it
+
+```diff
+// remix.config.js
+const { createRoutesFromFolders } = require("@remix-run/v1-route-convention");
+
+- exports.ignoredRouteFiles = ["**/.*"];
++ exports.ignoredRouteFiles = ["**/*"];
++ exports.routes = (defineRoutes) => createRoutesFromFolders(defineRoutes, { 
++   ignoredFilePatterns: ["**/.*"] 
++ });
+```