[Add] Xiaomi icon (#1687)

* Add Xiaomi icon

* Add Xiaomi data

* Update Xiaomi

Add `role` attribute and minimise to one line.

* Change role from "image" to "img"

_data/simple-icons.json

@@ -3400,6 +3400,11 @@
             "hex": "13B5EA",
             "source": "https://www.xero.com/uk/about/media/downloads"
         },
+        {
+            "title": "Xiaomi",
+            "hex": "FA6709",
+            "source": "https://www.mi.com/global"
+        },
         {
             "title": "Xing",
             "hex": "006567",

icons/xiaomi.svg

@@ -0,0 +1 @@
+<svg role="img" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><title>Xiaomi icon</title><path d="M19.96 20a.32.32 0 01-.32-.32V4.32a.32.32 0 01.32-.32h3.71a.32.32 0 01.33.32v15.36a.32.32 0 01-.33.32zm-6.22 0s-.3-.09-.3-.32v-9.43A2.18 2.18 0 0011.24 8H4.3c-.4 0-.3.3-.3.3v11.38c0 .27-.3.32-.3.32H.33a.32.32 0 01-.33-.32V4.32A.32.32 0 01.33 4h12.86a4.28 4.28 0 014.25 4.27l.01 11.41a.32.32 0 01-.32.32zm-6.9 0a.3.3 0 01-.3-.3v-9a.3.3 0 01.3-.3h3.77a.3.3 0 01.29.3v9a.3.3 0 01-.3.3z"/></svg>