ADD: adden README and License

README.md

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+# Studia
+
+Studia is an open-source web app for efficient learning with index cards (flashcards). It focuses on fast review, spaced repetition, and simple deck management to help users retain knowledge.
+
+## Features
+- Create and study decks of index cards (question/answer)
+- Spaced repetition algorithm with review scheduling
+- Import/export decks (JSON/CSV)
+- Progress tracking and basic statistics
+- Keyboard-first study experience and mobile-friendly UI
+- Offline support (cached decks) and theming
+
+
+## Contributing
+Contributions welcome. Please:
+- Open issues for bugs or feature requests
+- Fork, branch, and submit PRs with clear descriptions
+- Add tests for new behavior and follow code style
+
+## License
+A