Add documentation for aarch64 compatibility

Co-authored-by: hlohaus <983577+hlohaus@users.noreply.github.com>

docs/aarch64-compatibility.md

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+# aarch64 (ARM64) Compatibility
+
+This document describes the compatibility status and known issues for g4f on aarch64 (ARM64) systems.
+
+## Issue Resolution
+
+**Fixed in this release:** The "Illegal instruction (core dumped)" error that occurred when importing g4f on aarch64 systems has been resolved.
+
+### Problem
+Previously, g4f would crash with "Illegal instruction (core dumped)" on ARM64 systems (such as Apple Silicon Macs, Raspberry Pi, AWS Graviton instances, etc.) due to compiled dependencies with architecture-specific optimizations.
+
+### Solution
+The library now includes proper error handling for architecture-incompatible dependencies:
+- Safe import mechanisms prevent crashes when compiled libraries are unavailable
+- Graceful fallbacks to alternative implementations when possible
+- Clear error messages when specific features require unavailable dependencies
+
+## Compatibility Status
+
+### ✅ Working Features
+- Basic client functionality (`from g4f.client import Client`)
+- CLI commands (`g4f --help`, `g4f client --help`)
+- Providers that use standard HTTP libraries
+- Most text generation functionality
+
+### ⚠️ Limited Features  
+Some advanced features may have reduced functionality on aarch64:
+- Providers requiring `curl_cffi` will fall back to `aiohttp`
+- Browser automation features may not be available
+- Some performance optimizations may not be active
+
+### 📋 Requirements
+For full functionality on aarch64, ensure you have:
+```bash
+# Basic requirements (should work on all architectures)
+pip install -r requirements-min.txt
+
+# Full requirements (some packages may need compilation on aarch64)
+pip install -r requirements.txt
+```
+
+## Testing Your Installation
+
+You can verify your installation works correctly:
+
+```python
+# Test basic import
+from g4f.client import Client
+client = Client()
+print("✓ g4f imported successfully")
+
+# Test CLI
+import subprocess
+result = subprocess.run(['g4f', '--help'], capture_output=True)
+print("✓ CLI works" if result.returncode == 0 else "✗ CLI issues")
+```
+
+## Known Issues
+
+1. **Performance**: Some providers may have reduced performance due to fallback implementations
+2. **Browser Features**: nodriver and webview functionality may not be available
+3. **Image Processing**: Some image-related features may have compatibility issues
+
+## Getting Help
+
+If you encounter issues on aarch64:
+1. First try with minimal requirements: `pip install -r requirements-min.txt`
+2. Check if the issue persists with basic functionality
+3. Report architecture-specific issues with your system details:
+   - Architecture: `uname -m`
+   - OS: `uname -a` 
+   - Python version: `python --version`