Add README.md for fullstack examples directory

Co-Authored-By: [email protected] <[email protected]>

Author: devin-ai-integration[bot]

fullstack/README.md

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+# wolfSSL Full-Stack Examples
+
+This directory contains examples demonstrating full-stack implementations using wolfSSL components on FreeRTOS.
+
+## Examples
+
+### 1. FreeRTOS + wolfIP + wolfSSL HTTPS Server
+Located in `freertos-wolfip-wolfssl-https/`
+
+Demonstrates:
+- HTTPS server implementation using wolfSSL
+- FreeRTOS POSIX simulation
+- wolfIP network stack integration
+- TLS 1.3 support
+- Network configuration using TAP interface
+
+See the example's README.md for detailed setup and usage instructions.
+
+### 2. FreeRTOS + wolfIP + wolfMQTT Client
+Located in `freertos-wolfip-wolfmqtt/`
+
+Demonstrates:
+- MQTT client with TLS 1.3 using wolfMQTT
+- FreeRTOS POSIX simulation
+- wolfIP network stack integration
+- Secure MQTT over TLS
+- Network configuration using TAP interface
+
+See the example's README.md for detailed setup and usage instructions.
+
+## Common Requirements
+- Linux environment
+- Root access (for TAP interface setup)
+- CMake 3.13+
+- GCC
+- wolfSSL libraries
+- FreeRTOS source (automatically downloaded by setup scripts)
+
+## Network Configuration
+Both examples use a TAP interface for network connectivity:
+- Host IP (Linux): 10.10.0.1/24
+- FreeRTOS client/server: 10.10.0.10/24
+
+## Building and Running
+Each example contains:
+- `setup.sh`: Downloads and configures FreeRTOS
+- `setup_network.sh`: Configures TAP interface
+- `CMakeLists.txt`: Build configuration
+- Test scripts for verification
+
+Follow the README.md in each example directory for specific instructions.