feat: adds create-medusa-app (#377)

* feat: copied from medusa-cli

* chore: gitignore

* fix: add admin + storefront

* fix: dev experience enhancement

packages/create-medusa-app/src/panic-handler.js

@@ -0,0 +1,25 @@
+export const panicHandler = (panicData = {}) => {
+  const { id, context } = panicData
+  switch (id) {
+    case "10000":
+      return {
+        message: `Looks like you provided a URL as your project name. Try "medusa new my-medusa-store ${context.rootPath}" instead.`,
+      }
+    case "10001":
+      return {
+        message: `Looks like you provided a URL as your project name. Try "medusa new my-medusa-store ${context.rootPath}" instead.`,
+      }
+    case "10002":
+      return {
+        message: `Could not create project because ${context.path} is not a valid path.`,
+      }
+    case "10003":
+      return {
+        message: `Directory ${context.rootPath} is already a Node project.`,
+      }
+    default:
+      return {
+        message: "Unknown error",
+      }
+  }
+}