examples/depth: Add tracking and depth sample

Author: bfulkers-i

examples/depth.md

@@ -24,6 +24,7 @@ This is a subset of SDK examples, for full list see [readme.md](./readme.md)
 |[Record & Playback](./record-playback)| C++ | Demonstrating usage of the recorder and playback devices | :star::star: | [![Depth Sensing - Structured Light, Stereo and L500](https://img.shields.io/badge/-Depth-5bc3ff.svg)](./depth.md) |
 |[Motion](./motion)| C++ | Demonstrates how to use data from gyroscope and accelerometer to compute the rotation of the camera | :star::star: | [![Depth with IMU](https://img.shields.io/badge/-D435i-5bc3ff.svg)](./depth.md) |
 |[DNN](../wrappers/opencv/dnn)| C++ & OpenCV | Intel RealSense camera used for real-time object-detection | :star::star: | [![Depth Sensing - Structured Light, Stereo and L500](https://img.shields.io/badge/-Depth-5bc3ff.svg)](./depth.md) |
+|[Tracking and Depth](./tracking-and-depth)| C++ | Shows how to use the tracking camera T265 together with a depth camera to display a 3D pointcloud with respect to a static reference frame | :star::star: | [![Depth Sensing - Structured Light, Stereo and L500](https://img.shields.io/badge/-Depth-5bc3ff.svg)](./depth.md) [![Motion Tracking - T260 and SLAM](https://img.shields.io/badge/-Tracking-0e2356.svg)](../doc/t265.md#examples-and-tools)
 |[Software Device](./software-device)| C++ | Shows how to create a custom `rs2::device` | :star::star::star: | [![Depth Sensing - Structured Light, Stereo and L500](https://img.shields.io/badge/-Depth-5bc3ff.svg)](./depth.md) [![Motion Tracking - T260 and SLAM](https://img.shields.io/badge/-Tracking-0e2356.svg)](../doc/t265.md#examples-and-tools) |
 |[Sensor Control](./sensor-control)| C++ | A tutorial for using the `rs2::sensor` API | :star::star::star: | [![Depth Sensing - Structured Light, Stereo and L500](https://img.shields.io/badge/-Depth-5bc3ff.svg)](./depth.md) [![Motion Tracking - T260 and SLAM](https://img.shields.io/badge/-Tracking-0e2356.svg)](../doc/t265.md#examples-and-tools) |
 |[GrabCuts](../wrappers/opencv/grabcuts)| C++ & OpenCV | Simple background removal using the GrabCut algorithm | :star::star::star: | [![Depth Sensing - Structured Light, Stereo and L500](https://img.shields.io/badge/-Depth-5bc3ff.svg)](./depth.md)  |