Add sample app to stream with WebRTC and Stream Producer SDK simultaneously

.gitmodules

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+[submodule "webrtc-c/webrtc-and-directstream/amazon-kinesis-video-streams-producer-sdk-cpp"]
+	path = webrtc-c/webrtc-and-directstream/amazon-kinesis-video-streams-producer-sdk-cpp
+	url = https://github.com/awslabs/amazon-kinesis-video-streams-producer-sdk-cpp.git
+[submodule "webrtc-c/webrtc-and-directstream/amazon-kinesis-video-streams-webrtc-sdk-c"]
+	path = webrtc-c/webrtc-and-directstream/amazon-kinesis-video-streams-webrtc-sdk-c
+	url = https://github.com/awslabs/amazon-kinesis-video-streams-webrtc-sdk-c.git

webrtc-c/webrtc-and-directstream/.gitmodules

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+[submodule "amazon-kinesis-video-streams-producer-sdk-cpp"]
+	path = amazon-kinesis-video-streams-producer-sdk-cpp
+	url = https://github.com/awslabs/amazon-kinesis-video-streams-producer-sdk-cpp.git

webrtc-c/webrtc-and-directstream/README.md

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+# KVS WebRTC and Direct Stream Simultaneously
+## Overview
+
+Added a gstreamer app sample (`kvsWebRTCAndDirectStream.c`) to support streaming video to KVS with WebRTC SDK (for real-time use) and Stream Producer SDK (for video ingestion), simultaneously from 1 camera source.
+
+This sample is currently only tested on Raspberry Pi 3B equipped with USB Camera. 
+
+## Prerequisites
+
+- AWS Account with configured:
+  - Kinesis Video Streams
+  - IAM role with appropriate permissions
+- **Physical webcam required**: The application uses `autovideosrc` and will not fallback to `videotestsrc` if no camera is connected
+
+## Installation and Configuration
+
+1. Clone this repository to your Raspberry Pi with submodules:
+   ```
+   git clone --recurse-submodules https://github.com/aws-samples/amazon-kinesis-video-streams-demos.git
+   ```
+
+   Or if already cloned, initialize submodules:
+   ```
+   git submodule update --init --recursive
+   ```
+
+2. Copy the sample file to the WebRTC SDK samples directory:
+   ```
+   cp kvsWebRTCAndDirectStream.c amazon-kinesis-video-streams-webrtc-sdk-c/samples/
+   ```
+
+3. Configure your AWS credentials on the Raspberry Pi
+
+### Building the AWS SDKs
+
+Refer to each SDK main repository for the details of how to build. `-DALIGNED_MEMORY_MODEL=ON` flag might need to be used on Raspberry Pi 4B and 5B.
+
+- https://github.com/awslabs/amazon-kinesis-video-streams-webrtc-sdk-c
+- https://github.com/awslabs/amazon-kinesis-video-streams-producer-sdk-cpp
+
+#### Building the KVS Producer SDK
+
+```
+cd amazon-kinesis-video-streams-producer-sdk-cpp
+mkdir -p build
+cd build
+cmake .. -DBUILD_DEPENDENCIES=OFF
+make -j
+```
+
+#### Building the KVS WebRTC SDK
+
+```
+cd amazon-kinesis-video-streams-webrtc-sdk-c
+mkdir -p build
+cd build
+cmake .. -DBUILD_DEPENDENCIES=OFF
+make -j
+```
+
+## Usage
+
+1. Configure your AWS credentials on the Raspberry Pi
+
+2. Configure GStreamer plugin path with the path where you build the KVS Streams Producer app, e.g., `export GST_PLUGIN_PATH=/home/pi/amazon-kinesis-video-streams-producer-sdk-cpp/build`
+
+3. Go to `amazon-kinesis-video-streams-webrtc-sdk-c/build/` and run `./samples/kvsWebRTCAndDirectStream <signaling channel name> <kvs stream name>`
+
+## Screenshots
+
+The following screenshots demonstrate WebRTC and Stream Producer running simultaneously:
+
+### WebRTC Signaling Channel Viewer
+![WebRTC Console View](screenshots/Screenshot-WebRTC.png)
+*Real-time WebRTC streaming through the signaling channel*
+
+### KVS Stream Viewer
+![KVS Stream Console View](screenshots/Screenshot-KVSStream.png)
+*Near real-time video ingestion to Kinesis Video Stream*
+
+### Application Logs
+
+#### WebRTC Logs
+![WebRTC Logs](screenshots/Screenshot-Log-WebRTC.png)
+*WebRTC connection and streaming logs*
+
+#### KVS Stream Logs
+![KVS Stream Logs 1](screenshots/Screenshot-Log-KVSStream-1.png)
+![KVS Stream Logs 2](screenshots/Screenshot-Log-KVSStream-2.png)
+*Kinesis Video Stream ingestion logs showing successful simultaneous operation*
+
+## License
+
+This project uses components from AWS Kinesis Video Streams SDKs which are licensed under the Apache License 2.0.