message: Add multicluster design proposal
  ### Description of the change
  Adds to the repository the link to the new design proposal for
  multicluster.
  ### Benefits
  Design proposals are properly tracked
  ### Possible drawbacks
  N/A
  ### Applicable issues
  fixes
diff: @@ -27,3 +27,4 @@ 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) |
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