Add create-react-router CLI

Author: markdalgleish

packages/create-react-router/.eslintrc.js

@@ -0,0 +1,7 @@
+module.exports = {
+  extends: "../../.eslintrc.js",
+  rules: {
+    // we have an example where we need this
+    "no-undef": 0,
+  },
+};

packages/create-react-router/README.md

@@ -0,0 +1,7 @@
+# create-react-router
+
+Create a new React Router app.
+
+```sh
+npx create-react-router
+```