Add GLSL icons

Would it be possible to add icons for GLSL shader files?

Also just noting that there’s no actual standard for the extension, so I’ve shown three common ways of naming these files:

• .glsl as a generic shader extension

• .frag/.vert and .frag.glsl / .vert.glsl to explicitly specify the type of shader (fragment or vertex). I think .fs / .vs are also used

Not saying there necessarily needs to be 3 different icons, would be nice though.

Thanks!