Add comprehensive documentation for example requirements

- Add configuration requirements for each example
- Document hardware dependencies for UART examples
- Add troubleshooting guide
- Categorize examples by functionality
- Add TLS 1.3 resume certificate requirements

Co-Authored-By: eric@wolfssl.com <eric@wolfssl.com>

tls/uart_requirements.md

@@ -0,0 +1,28 @@
+# UART Example Hardware Requirements
+
+## Required Hardware
+1. Physical UART device (e.g., USB-to-UART converter)
+2. Device must be accessible at /dev/ttyUSB0
+
+## Setup
+1. Connect UART device to USB port
+2. Verify device is recognized:
+   ```bash
+   ls -l /dev/ttyUSB0
+   ```
+3. Ensure user has proper permissions:
+   ```bash
+   sudo usermod -a -G dialout $USER
+   ```
+
+## Testing Without Hardware
+The UART examples cannot be tested without physical hardware. For development and testing purposes:
+1. Use the standard TLS examples (client-tls/server-tls) instead
+2. Use TCP examples (client-tcp/server-tcp) for basic communication testing
+3. Use memory-based examples (memory-tls) for protocol testing
+
+## Error Messages
+Common error: "Error opening /dev/ttyUSB0: Error 2 (No such file or directory)"
+- Indicates missing UART hardware
+- Expected in virtual/CI environments
+- Not a code issue, requires physical hardware