Add the MIT license

LICENSE with the standard text, `license = "MIT"` in Cargo.toml so the metadata
matches, and a line in the README pointing at it.

Copyright is attributed to `randogoth`, taken from the repository's author
setting, and dated 2026.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Cargo.toml

@@ -4,6 +4,7 @@ version = "0.1.0"
 edition = "2024"
 rust-version = "1.97"
 description = "Aggregate and sync events between CalDAV, Google Calendar and iCal feeds"
+license = "MIT"
 publish = false
 
 [dependencies]

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 randogoth
+
+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

@@ -313,3 +313,7 @@ configuration between machines; leave this behind.
 - **A failing `pimsync sync` stops the whole CalDAV leg.** Google endpoints are
   isolated from each other, but pimsync is a single process covering every
   CalDAV and feed pair, and a failure does not say which pair it belongs to.
+
+## License
+
+MIT. See [LICENSE](LICENSE).