added sample models

added 4 lights, 2 tone mappings, attenuation

added camera and light modes

added directed light

Create README.md

finally fixed the issue with blinking when rotating camera

made models lighter, simplified code

tone mapping + gamma correction + little refactor

minor pbr fixes

pbr attempt (todo: ability to customize mrao + checkbox 'pbr' + check work on sphere)

corrected phong lighting principles, added descriptions, improved texture mappings

added perspective projection correction for texture mapping

added base color/normal/emission map textures * little improvements

added base color/normal/emission map textures

throttling drag?