Add Polymer Project (#2353)

* Add polymer.svg

* Add Polymer data

* Rename Polymer as Polymer Project

* Rename as polymerproject.svg + update title

_data/simple-icons.json

@@ -3390,6 +3390,11 @@
             "hex": "F43E37",
             "source": "https://blog.pocketcasts.com/press/"
         },
+        {
+            "title": "Polymer Project",
+            "hex": "FF4470",
+            "source": "https://github.com/Polymer/polymer-project.org/tree/master/app/images/logos"
+        },
         {
             "title": "PostgreSQL",
             "hex": "336791",

icons/polymerproject.svg

@@ -0,0 +1 @@
+<svg role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><title>Polymer Project icon</title><path d="M14.4 3.686L7.2 16.16 4.8 12l4.8-8.314H4.8L0 12l2.4 4.159 2.4 4.155h4.8l7.2-12.469L19.2 12l-4.8 8.314h4.8l2.4-4.155L24 12l-2.4-4.155-2.4-4.159Z"/></svg>