Add drm modesetting example

The drmmodeset.c example is a short tutorial how to use the DRM mode-setting
API. It describes the concept of connectors, CRTCs, encoders and
framebuffers and shows how to make use of them in simple
graphics-applications.
Add makefile for compilation
Merge pull request #3 from girish2k44/drmmodeset_file

Added drmmodeset.c drm modeset example and makefile