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/1000_decimals.md

@@ -0,0 +1,44 @@
+# Performance Report: 1000 Decimals
+
+## 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)
+
+## Performance Charts
+
+**Compiled Languages:**
+```mermaid
+xychart-beta
+    title "Compiled Languages - Time (ms) at 1000 decimals"
+    x-axis ["Assembly", "C", "C++", "Rust", "Go", "Nim", "Odin", "Fortran", "Swift", "Crystal"]
+    y-axis "Time (ms)" 0 --> 35
+    bar [9, 9, 30, 9, 9, 9, 9, 31, 29, 29]
+```
+
+**JIT-Compiled Languages:**
+```mermaid
+xychart-beta
+    title "JIT-Compiled Languages - Time (ms) at 1000 decimals"
+    x-axis ["Java", "C#", "Kotlin", "Julia"]
+    y-axis "Time (ms)" 0 --> 310
+    bar [57, 57, 83, 299]
+```
+
+**Interpreted Languages:**
+```mermaid
+xychart-beta
+    title "Interpreted Languages - Time (ms) at 1000 decimals"
+    x-axis ["Python", "Perl", "PHP", "Ruby", "JavaScript"]
+    y-axis "Time (ms)" 0 --> 240
+    bar [60, 103, 79, 79, 233]
+```
+
+
+
+---
+
+*Generated from Pi Calculation Benchmark - 1000 decimals precision*