Update README with license and attribution details

Author: InfinityLoop1

README.md

@@ -1,3 +1,19 @@
 # Mathima
 
 A **work in progress** smart and simple planner designed for students. Easily track homework, quizzes, and due dates! With built-in support for your daily schedule, Mathima helps you stay organized in a way that actually fits your school day.
+
+## License
+
+This project is licensed under the [PolyForm Noncommercial License 1.0.0](LICENSE).
+
+You may use, modify, and share this code for **noncommercial purposes** only.  
+Commercial use is prohibited without a separate license from the author.
+
+**Attribution requirement:**  
+This project includes code from InfinityLoop.  
+Credit must appear in both:
+
+- The repository README, and  
+- A user-accessible "About" or "Credits" section of the software or site.
+
+For full license terms, see the LICENSE file.