MIT-Lizenz hinzugefügt und in README dokumentiert

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2025 M. Busche
+
+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

@@ -98,5 +98,9 @@ docker-compose up --build
 - Das Projekt ist auf Gitea gehostet: https://gitea.elpatron.me/elpatron/datecalc
 - Modernes, responsives Design mit Akkordeon und Icons
 
+## Lizenz
+
+Dieses Projekt steht unter der [MIT-Lizenz](LICENSE).
+
 ---
 (c) Elpatron