Reorganize documentation: create separate reports for each decimal level

- Create reports/ directory with detailed performance reports
- Simplify README.md to provide overview and summary
- Add links to detailed reports for each decimal level (1, 2, 5, 10, 100, 1000, 2000)
- Keep summary table and key findings in main README
- Remove verbose charts from main README to reduce noise

reports/summary.md

@@ -0,0 +1,54 @@
+# Pi Calculation Benchmark: Performance Summary
+
+## Overview
+
+This study compares the performance of 34 programming languages when calculating π (pi) with high precision.
+
+## Test Environment
+
+**Hardware:**
+- **Model:** MacBook Neo (Mac17,5)
+- **Processor:** Apple A18 Pro (6 cores: 2 performance + 4 efficiency)
+- **Memory:** 8 GB RAM
+- **Operating System:** macOS (Darwin)
+
+## Method: Machin's Formula
+
+All implementations use Machin's formula for π calculation:
+
+```
+π/4 = 4·arctan(1/5) - arctan(1/239)
+```
+
+## Performance Reports by Decimal Level
+
+- [1 Decimal](reports/1_decimals.md) - Minimal precision
+- [2 Decimals](reports/2_decimals.md) - Low precision
+- [5 Decimals](reports/5_decimals.md) - Medium precision
+- [10 Decimals](reports/10_decimals.md) - Standard precision
+- [100 Decimals](reports/100_decimals.md) - High precision
+- [1000 Decimals](reports/1000_decimals.md) - Very high precision
+- [2000 Decimals](reports/2000_decimals.md) - Extreme precision
+
+## Key Findings
+
+### Fastest Languages (100 decimals)
+1. **C** - 9ms (compiled)
+2. **Assembly** - 9ms (compiled)
+3. **Rust** - 9ms (compiled)
+4. **Go** - 9ms (compiled)
+5. **Nim** - 9ms (compiled)
+
+### Memory Efficiency (100 decimals)
+- **C, Rust, Assembly**: < 1 MB
+- **JIT Languages**: ~2 MB
+- **Interpreted Languages**: ~2 MB
+
+### Performance Scaling
+- Compiled languages maintain consistent performance across all decimal levels
+- JIT languages show startup overhead but good performance
+- Interpreted languages scale poorly with increased precision
+
+---
+
+*Generated from Pi Calculation Benchmark*