Add DAP Proxies and Utilities implementors page

_implementors/proxies.md

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+---
+layout: implementors
+title:  "DAP Proxies and Utilities"
+shortTitle: "Proxies"
+author: Microsoft
+index: 4
+---
+
+The following table lists known tools that route, multiplex, or observe the Debug Adapter Protocol — tools that sit between adapters and clients to enable scenarios beyond what a single point-to-point DAP connection supports.
+
+| Tool | Description | Maintainer |
+|------|-------------|------------|
+[dap-mux](https://github.com/dap-mux/dap-mux)|DAP multiplexer — connects multiple clients (editors, REPLs) to a single debug adapter session simultaneously, with session persistence and late-join state replay|[@wolf](https://github.com/wolf)
+[dap-observer](https://github.com/shaleh/dap-observer)|Read-only DAP client that connects to a running dap-mux session and renders the current stack frame's variables as a navigable terminal tree|[@shaleh](https://github.com/shaleh)
+{: .table .table-bordered .table-responsive}
+
+*If you are missing a DAP proxy or utility please create a pull request in GitHub against this markdown [document](https://github.com/Microsoft/debug-adapter-protocol/blob/main/_implementors/proxies.md)*