Add VSLAM or 3D lidar SLAM algorithms

[devyani-code]

Visual SLAM and 3D Lidar SLAM algorithms are widely used in the industry. Concepts like visual odometry, object tracking using 3D lidars, etc., can be helpful to many people.

[AtsushiSakai]

I think it’s a good idea. However, it might be difficult to implement sample code for 3D LIDAR or Visual SLAM without using any external libraries... But PR is welcome.

[kartikmadhira1]

I think adding core concepts in 3D computer vision first would be a good starting point - Stereo, E and F matrices, PnP, Triangulation and Bundle Adjustment without libraries. These can then be re-arranged for a bigger VSLAM module.