Update Readme.md

Adding Namespace Editing to README TOC

Author: pixar-oss

proposals/Readme.md

@@ -16,3 +16,4 @@ See the [OpenUSD Proposals Status](https://github.com/orgs/PixarAnimationStudios
 - [Spline Animation](https://github.com/PixarAnimationStudios/OpenUSD-proposals/tree/main/proposals/spline-animation) ![Status:Published](https://img.shields.io/badge/published-green) ([current PRs and issues](https://github.com/PixarAnimationStudios/USD-proposals/pulls?q=is%3Apr+label%3Ausd-spline-animation+))
 - [Stage Variable Expressions](https://github.com/PixarAnimationStudios/USD-proposals/tree/main/proposals/stage_variable_expressions) ![Status:Implemented, 23.11](https://img.shields.io/badge/implemented-blue) ([current PRs and issues](https://github.com/PixarAnimationStudios/USD-proposals/pulls?q=is%3Apr+label%3Ausd-stage-variables))
 - [Unicode Identifiers in USD](https://github.com/PixarAnimationStudios/USD-proposals/tree/main/proposals/tf_utf8_identifiers) ![Status:Published](https://img.shields.io/badge/published-green) ([current PRs and issues](https://github.com/PixarAnimationStudios/USD-proposals/pulls?q=is%3Apr++label%3Ausd-utf8-identifiers+))
+- [Namespace Editing](https://github.com/PixarAnimationStudios/OpenUSD-proposals/blob/main/proposals/namespace_editing/README.md) ![Status:Published](https://img.shields.io/badge/published-green)