First time index example

Gave it a try but ran into the following when creating the index:

```
# Example
cr index --charts-repo https://my-repo/k8s/helm/charts --owner wallyqs --git-repo https://github.com/wallyqs/my-charts

====> UpdateIndexFile new index at .cr-index/index.yaml
Error: open .cr-release-packages: no such file or directory
```

Thanks :)