added contributors

src/mol-canvas3d/passes/postprocessing.ts

src/mol-gl/shader/chunks/wboit-write.glsl.ts

src/mol-gl/shader/outlines.frag.ts

src/mol-gl/shader/postprocessing.frag.ts

src/mol-gl/shader/ssao-blur.frag.ts

src/mol-gl/shader/ssao.frag.ts