Add Koofr icon (#423)

## Description

Add Koofr icon

## Type of Change

- [x] 🖼️ New icon
- [ ] ✨ New feature (non-breaking change which adds functionality)
- [ ] 🛠️ Bug fix (non-breaking change which fixes an issue)
- [ ] ❌ Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] 🧹 Code refactor
- [ ] ✅ Build configuration change
- [ ] 📝 Documentation
- [ ] 🗑️ Chore

---------

Co-authored-by: Vishnu Mohandas <vishnu@ente.io>

assets/custom-icons/_data/custom-icons.json

@@ -106,6 +106,10 @@
       "title": "Kick",
       "hex": "53FC19"
     },
+    {
+      "title": "Koofr",
+      "hex": "71BA05"
+    },
     {
       "title": "Kraken",
       "hex": "5848D5"

assets/custom-icons/icons/koofr.svg

@@ -0,0 +1,4 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1024 1024">
+   <circle cx="512" cy="512" r="512" style="fill:#263238"/>
+   <path d="M768 554.7V640c0 23.6-19.1 42.7-42.7 42.7H298.7c-23.6 0-42.7-19.1-42.7-42.7v-85.3c0-23.6 19.1-42.7 42.7-42.7h426.7c23.5 0 42.6 19.1 42.6 42.7zm-42.7-71.1c9.4 0 18.7 1.9 27.4 5.5l-85.8-128.7c-7.9-11.9-21.2-19-35.5-19H392.6c-14.3 0-27.6 7.1-35.5 19L271.3 489c8.7-3.6 18-5.5 27.4-5.5h426.6zm-42.6 85.3c-15.7 0-28.4 12.7-28.4 28.4s12.7 28.4 28.4 28.4 28.4-12.7 28.4-28.4-12.7-28.4-28.4-28.4zm-85.4 0c-15.7 0-28.4 12.7-28.4 28.4s12.7 28.4 28.4 28.4 28.4-12.7 28.4-28.4c.1-15.7-12.7-28.4-28.4-28.4z" style="fill:#fff"/>
+</svg>