Add flashalpha-fill-simulator to Backtest + live trading (#101)

Co-authored-by: Tomasz Dobrowolski <tom@tecware.com>

Readme.md

@@ -138,6 +138,7 @@ Note: the one marked as `Live Trading` has reasonable live trading support for a
 - [zipline](https://github.com/quantopian/zipline) ![GitHub last commit (branch)](https://img.shields.io/github/last-commit/quantopian/zipline/master) ![GitHub Repo stars](https://img.shields.io/github/stars/quantopian/zipline?style=social) | Python | - Zipline is a Pythonic algorithmic trading library. It is an event-driven system for backtesting.
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+- [flashalpha-fill-simulator](https://github.com/FlashAlpha-lab/flashalpha-fill-simulator) ![GitHub last commit (branch)](https://img.shields.io/github/last-commit/FlashAlpha-lab/flashalpha-fill-simulator/master) ![GitHub Repo stars](https://img.shields.io/github/stars/FlashAlpha-lab/flashalpha-fill-simulator?style=social) | Python, Options | - Realistic limit-order fill simulator for options credit/debit spreads. Models post-and-wait limits, stale-quote guards, deterministic same-bar tiebreaks, and a patient-then-cross exit. Engine-agnostic per-bar primitive that embeds in QuantConnect / Backtrader / custom loops; zero runtime dependencies.
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 - [Gunbot Quant](https://github.com/GuntharDeNiro/gunbot-quant) ![GitHub last commit (branch)](https://img.shields.io/github/last-commit/GuntharDeNiro/gunbot-quant/master) ![GitHub Repo stars](https://img.shields.io/github/stars/GuntharDeNiro/gunbot-quant?style=social) | Python | - Standalone application for market screening and backtesting. Supports multi-asset, multi-strategy backtests. Includes user interface and CLI options.
 - [PythonTradingFramework](https://github.com/JustinGuese/python_tradingbot_framework) ![Github last commit (branch)](https://img.shields.io/github/last-commit/JustinGuese/python_tradingbot_framework/main) | Python | - Python algorithmic trading bot framework for Kubernetes: backtesting, hyperparameter optimization, 150+ technical analysis indicators (RSI, MACD, Bollinger Bands, ADX), portfolio management, PostgreSQL integration, Helm deployment, CronJob scheduling. Minimal overhead, production-ready, Yahoo Finance data.