Add GLSL inline shader code injection example (#56)

* Add examples/glsl and link into index.html and examples.html.

* Add comment to example defining struct Gsplat.

* Adjust tab size formatting to 2

src/index.ts

@@ -48,6 +48,7 @@ export {
 } from "./splatConstructors";
 
 export * as generators from "./generators";
+export * as modifiers from "./modifiers";
 
 export { VRButton } from "./vrButton";
 export {