Add example candlestick chart to examples directory

- Save AAPL 30-day candlestick chart as reference
- Add README explaining chart features and data source
- Example shows green/red candles with dark theme

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

examples/README.md

@@ -0,0 +1,22 @@
+# Chart Examples
+
+This directory contains example chart images generated by the Discord Stock Bot.
+
+## Candlestick Chart
+
+**File:** `candlestick_chart_example.png`
+
+**Description:** 30-day daily candlestick chart for AAPL generated using Polygon.io data and matplotlib.
+
+**Features:**
+- Green candles: Closing price > Opening price (bullish)
+- Red candles: Closing price < Opening price (bearish)
+- Dark theme optimized for Discord
+- High/low wicks showing intraday range
+- 30 days of historical data
+
+**Data Source:** Polygon.io API (free tier)
+**Resolution:** Daily (1 day per candle)
+**Chart Library:** matplotlib 3.8.2
+
+This chart is automatically generated and attached to Discord embeds when users execute `!stock AAPL` or similar commands.