add missing mkdir
to be consistent with all the README file
@@ -57,6 +57,7 @@ Create and deploy an app-operator using the SDK CLI:
```sh
# Create an app-operator project that defines the App CR.
+$ mkdir -p $GOPATH/src/github.com/example-inc/
$ cd $GOPATH/src/github.com/example-inc/
$ operator-sdk new app-operator --api-version=app.example.com/v1alpha1 --kind=App
$ cd app-operator
