Add README and MIT license

LICENSE

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+MIT License
+
+Copyright (c) 2024
+
+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

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+# Hogwarts Arithmancy Flash Cards
+
+Interactive, themeable multiplication drill game with a Hogwarts aesthetic. Solve equations quickly to push back the “dementor” overlay, earn gold, buy cosmetics, and track mastery.
+
+## Highlights
+- Progressive levels tied to specific fact sets; mastery is earned per fact.
+- Dementor pressure overlay with growing dark circles and responsive glow on keypad/equation.
+- Gold + shop for skins, trails, pets; golden snitch bonus events.
+- Hint grid for misses, trouble-list focus, XP → queued fact practice (no auto-master).
+- Persistent progress via `localStorage`.
+
+## Play
+1) Open `index.html` in a browser (or serve the folder with any static server).
+2) Tap numbers to answer; `CAST SPELL` submits, `C` clears, `⌫` deletes.
+3) Earn gold/XP on correct answers; spend gold in the Student Trunk; track stats via the report card.
+
+## Development
+- Tech: vanilla HTML/CSS/JS (no build step).
+- Entry points: `index.html`, `style.css`, `app.js`.
+- Save data key: `arithmancyDataV17` in `localStorage`.
+
+## License
+MIT License. See `LICENSE` for details.