doc: license & README

Author: calmh

LICENSE

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+Copyright (C) 2024 Kastelo AB
+
+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.

README.md

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+# ezapt
+
+Simple utility to generate a valid APT distribution.
+
+## Usage
+
+```
+Usage: ezapt --dists=STRING --keyring=STRING [flags]
+
+Flags:
+  -h, --help               Show context-sensitive help.
+      --dists=STRING       Path to dists directory ($EZAPT_DISTS)
+      --keep-versions=2    Number of versions to keep ($EZAPT_KEEP_VERSIONS)
+      --keyring=STRING     Path to GPG keyring ($EZAPT_KEYRING)
+      --add=STRING         Path to packages to add ($EZAPT_ADD)
+```
+
+## License
+
+MIT