Add MIT license

LICENSE

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

@@ -109,3 +109,11 @@ it stays out of the way. The CC1101 board's BQ27220 gauge is not supported.
   caption bar, a LIVE/PAUSED badge, a hairline progress bar and a six-row menu page.
 * `settings.c` keeps the settings blob and the 12 favourite slots in NVS
   (namespace `widget`); `menu.c` is the knob-driven menu that edits them.
+
+## License
+
+MIT — see [LICENSE](LICENSE). Pin maps come from LilyGO's
+[T-Embed](https://github.com/Xinyuan-LilyGO/T-Embed) and
+[T-Embed-PN532](https://github.com/Xinyuan-LilyGO/T-Embed-PN532) repositories
+(MIT). `esp_new_jpeg` is fetched from Espressif's component registry at build
+time under its own license.