Add MIT license (Cargo.toml + LICENSE)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Cargo.toml

@@ -2,6 +2,7 @@
 name = "rustytokens"
 version = "0.1.0"
 edition = "2024"
+license = "MIT"
 
 [dependencies]
 clap = { version = "4", features = ["derive"] }

LICENSE

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

@@ -151,10 +151,8 @@ Test fixtures live in `tests/fixtures/` (own small Rust/Python/TS repos).
 ## Licensing
 
 `rustytokens` is an independent, clean-room implementation — no code is taken
-from any AGPL-licensed project, so the project's own source is yours to license
-however you choose (MIT, proprietary, commercial, closed-source). Decide and
-set it once: add a `license` field to `Cargo.toml` and, if you ship the source,
-drop in a `LICENSE` file.
+from any AGPL-licensed project. The project's own source is licensed under the
+MIT License (see `LICENSE`); `license = "MIT"` is set in `Cargo.toml`.
 
 Dependencies are all permissive (MIT / Apache-2.0 / BSL-1.0 / Unlicense):
 `clap`, `rusqlite`, `ignore`, `rayon`, `xxhash-rust`, `serde`, `serde_json`,