Add Backbone.js (#6714)

* Add Backbone.js

* Add 0.5px gaps

* Add gap to middle

Co-authored-by: Jorge Amado Soria Ramirez <darksoul.uci@gmail.com>

_data/simple-icons.json

@@ -1020,6 +1020,15 @@
             "hex": "F9DC3E",
             "source": "https://github.com/babel/website/blob/93330158b6ecca1ab88d3be8dbf661f5c2da6c76/website/static/img/babel-black.svg"
         },
+        {
+            "title": "Backbone.js",
+            "hex": "0071B5",
+            "source": "https://upload.wikimedia.org/wikipedia/commons/2/20/Backbone.js_logo.svg",
+            "license": {
+                "type": "MIT",
+                "url": "https://github.com/jashkenas/backbone/blob/master/LICENSE"
+            }
+        },
         {
             "title": "Badgr",
             "hex": "282C4C",

icons/backbonedotjs.svg

@@ -0,0 +1 @@
+<svg role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><title>Backbone.js</title><path d="M2.34 0v10.45l3.2-1.83V5.27l2.93 1.67 3.01-1.72L2.34 0zm19.31 0L12.5 5.22l3.02 1.73 2.94-1.68v3.35l3.2 1.83V0h-.01zm-9.9 5.64-9.4 5.38V24l9.4-5.36v-3.76l-6.21 3.56v-5.5l6.21-3.54V5.64zm.5 0V9.4l6.22 3.54v5.5l-6.22-3.56v3.76L21.66 24V11.02l-9.41-5.38zM7.7 12.3l-1.65.94v1.86l2.17 1.24 3.28-1.87-3.8-2.17zm8.61 0-3.8 2.16 3.28 1.88 2.17-1.24v-1.86l-1.65-.94z"/></svg>