Add Three.js (#4443)

_data/simple-icons.json

@@ -6620,6 +6620,11 @@
             "hex": "231F20",
             "source": "https://www.washingtonpost.com/brand-studio/archive/"
         },
+        {
+            "title": "Three.js",
+            "hex": "000000",
+            "source": "https://github.com/mrdoob/three.js/blob/a567b810cfcb7f6a03e4faea99f03c53081da477/files/icon.svg"
+        },
         {
             "title": "Threema",
             "hex": "3FE669",

icons/three-dot-js.svg

@@ -0,0 +1 @@
+<svg role="img" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><title>Three.js icon</title><path d="M.38 0a.268.268 0 0 0-.256.332l2.894 11.716a.268.268 0 0 0 .01.04l2.89 11.708a.268.268 0 0 0 .447.128L23.802 7.15a.268.268 0 0 0-.112-.45l-5.784-1.667a.268.268 0 0 0-.123-.035L6.38 1.715a.268.268 0 0 0-.144-.04L.456.01A.268.268 0 0 0 .38 0zm.374.654L5.71 2.08 1.99 5.664zM6.61 2.34l4.864 1.4-3.65 3.515zm-.522.12l1.217 4.926-4.877-1.4zm6.28 1.538l4.878 1.404-3.662 3.53zm-.52.13l1.208 4.9-4.853-1.392zm6.3 1.534l4.947 1.424-3.715 3.574zm-.524.12l1.215 4.926-4.876-1.398zm-15.432.696l4.964 1.424-3.726 3.586zM8.047 8.15l4.877 1.4-3.66 3.527zm-.518.137l1.236 5.017-4.963-1.432zm6.274 1.535l4.965 1.425-3.73 3.586zm-.52.127l1.235 5.012-4.958-1.43zm-9.63 2.438l4.873 1.406-3.656 3.523zm5.854 1.687l4.863 1.403-3.648 3.51zm-.54.04l1.214 4.927-4.875-1.4zm-3.896 4.02l5.037 1.442-3.782 3.638z"/></svg>