pkg: add README and license

pkg/README.md

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+# Packages
+
+This folder contains packages written for and used by Ghostty that could
+potentially be useful for other projects. These are in-tree with Ghostty
+because I don't want to maintain them as separate projects (i.e. get
+dedicated issues, PRs, etc.). If you want to use them, you can copy and
+paste them into your project.
+
+## License
+
+**This license only applies to the contents of the `pkg` folder within
+the Ghostty project. This license does not apply to the rest of the
+Ghostty project.**
+
+Copyright © 2024 Mitchell Hashimoto
+
+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.