Add Rainmeter (#3554)

Co-authored-by: Adam Rusted <hello@adamrusted.me>

_data/simple-icons.json

@@ -5555,6 +5555,11 @@
             "hex": "CE262F",
             "source": "https://help.radiopublic.com/hc/en-us/articles/360002546754-RadioPublic-logos"
         },
+        {
+            "title": "Rainmeter",
+            "hex": "19519B",
+            "source": "https://github.com/rainmeter/rainmeter-www/blob/867fd905fda8d1b1083730adcb7f49f1775cb5b0/source/img/logo_blue.ai"
+        },
         {
             "title": "Rakuten",
             "hex": "BF0000",

icons/rainmeter.svg

@@ -0,0 +1 @@
+<svg role="img" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><title>Rainmeter icon</title><path d="M12.7 1.088L12 0l-.7 1.088c-.751 1.168-7.342 11.525-7.342 15.366C3.958 20.615 7.565 24 12 24s8.042-3.385 8.042-7.546c0-3.84-6.591-14.197-7.342-15.366zM12 22.335c-3.516 0-6.377-2.638-6.377-5.881C5.623 13.908 9.732 6.756 12 3.1c2.268 3.656 6.377 10.809 6.377 13.355 0 3.242-2.861 5.88-6.377 5.88zm4.957-6.017c0 2.548-2.22 4.615-4.957 4.615-2.737 0-4.957-2.067-4.957-4.615 0-.163.021-.347.058-.549 0 0 1.306-2.616 4.847 0 2.999 2.215 4.95 0 4.95 0 .038.202.059.386.059.549z"/></svg>