Add existing to tracked

node_modules/protobufjs/ext/descriptor/README.md

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+# protobufjs/ext/descriptor
+
+This directory is kept as a backwards-compatible shim for `protobufjs/ext/descriptor` and may be removed in a future major release.
+
+The descriptor extension documentation now lives in [../README.md](../README.md#descriptor).

node_modules/protobufjs/ext/descriptor/index.d.ts

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+import * as $protobuf from "../..";
+import Long = require("long");

node_modules/protobufjs/ext/descriptor/index.js

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+"use strict";
+module.exports = require("../descriptor");