add link to operator plugin proposal to README (#5815)

related to #4920

site/content/docs/latest/reference/proposals/README.md

@@ -27,4 +27,5 @@ The proposal process is defined in [proposals.md](./proposals.md).
 | Kubeapps Catalog UI/UX proposal                                        | `antgamdia`    | Evaluate the improvement of the UI/UX when listing the catalog of charts/operators (apps henceforth) from different repositories when they include a large number of elements.              | [Design in GDoc](https://via.vmw.com/2020-kubeapps-ui-proposal)                                                     | Dec 9, 2020   | [#1010](https://github.com/kubeapps/kubeapps/issues/1010)     |
 | Design pluggable support                                               | `gfichtenholt` | Design specification of the pluggable architecture and support for multiple package formats                                                                                                 | [Design in GDoc](https://docs.google.com/document/d/1z03msZRGsRvcRaom-yrvEwIWcEfNy6fSA5Zg28gjYvA/edit?ts=60bb08cb#) | Jun 1, 2021   | [#2944](https://github.com/kubeapps/kubeapps/issues/2944)     |
 | Customizable UI for plugins                                               | `@castelblanque` | Design proposal for the customization of UI only from backend, in order to ease the burden of maintaining UI hardcoded cases per plugin.                     | [Design in GDoc](https://docs.google.com/document/d/1wVYQmYO2TADYOKfabSdLhjnreBjExuB9VxRE8zvvR4o) | Jul 12, 2022   | [#4365](https://github.com/kubeapps/kubeapps/issues/4365)     |
-| New multicluster design                                               | [`@castelblanque`](https://github.com/castelblanque) | A new design for extending multicluster support to all package plugins.                     | [Design in GDoc](https://docs.google.com/document/d/1qYHIa5dd9qwxTdzyNUn7yXacwmYjH7R-KnnWxXkPItE/) | Oct 24, 2022   | [#5152](https://github.com/vmware-tanzu/kubeapps/issues/5152)     |
+| New multicluster design                                               | [`@castelblanque`](https://github.com/castelblanque) | A new design for extending multicluster support to all package plugins.                     | [Design in GDoc](https://docs.google.com/document/d/1qYHIa5dd9qwxTdzyNUn7yXacwmYjH7R-KnnWxXkPItE/) | Oct 24, 2022   | [#5152](https://github.com/vmware-tanzu/kubeapps/issues/5152)     |
+| Operators Packaging Plugin                                               | `gfichtenholt` | Initial thoughts on new Operators Packaging Plugin                    | [Design in GDoc](https://docs.google.com/document/d/18CUxhkaQAmIneUsTGOhtjNpokO-pr5dp/edit?usp=sharing&ouid=112444106102121063639&rtpof=true&sd=true) | Dec 20, 2022   | [#4920](https://github.com/vmware-tanzu/kubeapps/issues/4920)     |