Add depth sensing sample and OpenGL tests

- Implemented a new sample application in main.cpp to capture and display a live 3D point cloud using the ZED SDK and OpenGL.
- Created test_opengl.cpp to demonstrate basic OpenGL rendering with depth testing using two triangles.
- Added test_points.cpp to visualize a grid of colored points in OpenGL, showcasing point rendering capabilities.

new_playground/depth-sensing/README.md

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+# ZED SDK - Depth Sensing
+
+This sample shows how to retreive the current point cloud.
+
+## Getting Started
+ - Get the latest [ZED SDK](https://www.stereolabs.com/developers/release/)
+ - Check the [Documentation](https://www.stereolabs.com/docs/)
+
+## Build the program
+ - Build for [Windows](https://www.stereolabs.com/docs/app-development/cpp/windows/)
+ - Build for [Linux/Jetson](https://www.stereolabs.com/docs/app-development/cpp/linux/)
+ 
+## Run the program
+- Navigate to the build directory and launch the executable
+- Or open a terminal in the build directory and run the sample :
+
+      ./ZED_Depth_Sensing
+
+### Features
+ - Camera live point cloud is retreived
+ - An OpenGL windows displays it in 3D
+
+## Support
+If you need assistance go to our Community site at https://community.stereolabs.com/