add copyright notice

LICENSE

@@ -0,0 +1,20 @@
+Copyright (c) 2024-2026 Beatrice Dellacà <hello@beatrice.wtf>
+
+All rights reserved.
+
+This software and its source code are the exclusive property of the
+copyright holder and are protected by copyright laws and international
+treaty provisions. No part of this software or its source code may be
+reproduced, distributed, transmitted, displayed, published, or broadcast,
+in any form or by any means, electronic or mechanical, including but not
+limited to photocopying, recording, or the use of any information storage
+and retrieval system, without the prior written permission of the
+copyright holder.
+
+No license or other right to use this software or its source code is
+granted by this notice, whether by implication, estoppel, or otherwise.
+
+THIS SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
+CLAIM, DAMAGES, OR OTHER LIABILITY ARISING FROM, OUT OF, OR IN
+CONNECTION WITH THIS SOFTWARE OR ITS USE.

readme.md

@@ -40,5 +40,6 @@
 | official repository | [gitea src](https://git.beatrice.wtf/Tools/autosqeal.git)     |
 | mirror repository   | [github src](https://github.com/mind-overflow/autosqueal.git) |
 | build status        | [drone-ci](https://drone.beatrice.wtf/Tools/autosqeal)        |
+| license             | copyright, all rights reserved — see [license](LICENSE)       |
 | dev email           | [hello@beatrice.wtf](mailto:hello@beatrice.wtf)               |