doc: add step to create the example directory
The instructions to create the `example-inc` project were missing a step to create the directory first.
@@ -36,6 +36,7 @@ This installs the CLI binary `operator-sdk` at `$GOPATH/bin`.
Use the CLI to create a new memcached-operator project:
```sh
+$ mkdir -p $GOPATH/src/github.com/example-inc/
$ cd $GOPATH/src/github.com/example-inc/
$ operator-sdk new memcached-operator --api-version=cache.example.com/v1alpha1 --kind=Memcached
$ cd memcached-operator
