Add guidelines for Copilot usage and commit messages

Updated dependencies and use Java 25.

.github/copilot-instructions.md

@@ -0,0 +1,9 @@
+When working on a prompt, please follow these instructions:
+
+1. When creating Code then just create the code required to complete the task. Do not include any explanations,
+   comments, or other text.
+2. After code changes, check if any JavaDoc is missing. Please see JavaDoc-rules.md for guidelines on adding JavaDoc.
+3. Create Unit Tests for the code you created or modified. Ensure that the tests cover various scenarios and edge cases.
+4. When writing commit messages, please follow the guidelines in git-commit-instructions.md to ensure clarity and
+   consistency.
+5. Ensure that your code adheres to the project's coding standards and best practices.