add darwin subpackage

Author: mzgoddard

dependencies/@bocoup/at-driver-generic-darwin-universal/LICENSE

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+The MIT License (MIT)
+
+Copyright for portions of AT Driver are held by Microsoft as part of the
+"Sample Text-to-Speech Engine and MakeVoice" project. All other copyright for
+AT Driver are held by Bocoup.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+ of this software and associated documentation files (the "Software"), to deal
+ in the Software without restriction, including without limitation the rights
+ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ copies of the Software, and to permit persons to whom the Software is
+ furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+ all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ THE SOFTWARE.

dependencies/@bocoup/at-driver-generic-darwin-universal/README.md

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+This is the `darwin` `universal` support software for `at-driver-generic`.

dependencies/@bocoup/at-driver-generic-darwin-universal/package.json

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+{
+  "name": "@bocoup/at-driver-generic-darwin-universal",
+  "version": "0.0.0",
+  "os": [
+    "darwin"
+  ],
+  "files": [
+    "ATDriverGenericMacOS.app"
+  ]
+}