Add project README

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

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+# fit
+
+A TypeScript trading bot built on the Alpaca paper trading API. It runs pluggable strategies that use indicators to generate buy/sell signals.
+
+## How it works
+
+1. The **Bot** waits for market open via the Alpaca clock API
+2. It runs all registered **Strategies** concurrently, each with its own capital allocation
+3. Each strategy uses **Indicators** to evaluate market conditions and returns buy/sell **Signals**
+4. The **Executor** processes the signals
+5. The bot loops hourly, waiting for the next market open
+
+## Setup
+
+Requires an [Alpaca](https://alpaca.markets/) paper trading account. Create a `.env` file in the project root:
+
+```
+ALPACA_KEY_ID=your_key_id
+ALPACA_SECRET_KEY=your_secret_key
+```
+
+Install dependencies:
+
+```
+npm install
+```
+
+## Running
+
+```sh
+# Build and run
+npm run build
+npm start
+
+# Development (auto-reload)
+npm run dev
+
+# Docker
+docker build -t fit .
+docker run --env-file .env fit
+```
+
+## Testing and linting
+
+```sh
+npm test
+npm run lint
+```
+
+## Project structure
+
+```
+src/
+  index.ts                  # Entry point, main loop
+  alpaca.ts                 # Alpaca API client wrapper
+  bot.ts                    # Orchestrator, runs strategies each day
+  executor.ts               # Executes signals from strategies
+  indicator.ts              # Indicator interface
+  strategy.ts               # Strategy/Signal interfaces
+  trading.ts                # Utilities (wait, market open, etc.)
+  momentum-indicator.ts     # Samples QQQ direction after open
+  momentum-strategy.ts      # Trades TQQQ/SQQQ based on momentum
+```