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/get-config-store.ts

@@ -0,0 +1,17 @@
+import Configstore from "configstore"
+
+let config: Configstore
+
+export const getConfigStore = (): Configstore => {
+  if (!config) {
+    config = new Configstore(
+      `medusa`,
+      {},
+      {
+        globalConfigPath: true,
+      }
+    )
+  }
+
+  return config
+}