add MIT license

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Saüc Vilà Gil
+
+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

@@ -140,3 +140,9 @@ fx-dashboard/
 - **Diversification ratio** = `Σ|eᵢ|·σᵢ / √(eᵀΣe)`; 1.0 means the book moves as a single bet, higher means correlations are reducing risk.
 - Stress shocks are **stylised** representative magnitudes for scenario analysis, not exact historical replays. JPY and CHF appreciate in risk-off scenarios (safe-haven behaviour); EM currencies (BRL, MXN, KRW) carry the largest downside.
 - Rates are ECB daily fixings — this models **FX risk on the book**, not intraday stock P&L (no equity price feed).
+
+---
+
+## License
+
+MIT — see [LICENSE](LICENSE).