Add briefcase icon

CHANGELOG.md

@@ -81,6 +81,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
   - `bell`
   - `bookmark`
   - `box`
+  - `briefcase`
   - `camera`
   - `check`
   - `check-circle`

icons-manifest.json

@@ -97,6 +97,7 @@
   "upload-cloud",
   "box",
   "target",
+  "briefcase",
   "loader",
   "clock",
   "watch",

icons/briefcase.svg

+<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="#000" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+  <rect x="2" y="7" width="20" height="14" rx="2" ry="2"/>
+  <path d="M16,21V5a2,2,0,0,0-2-2H10A2,2,0,0,0,8,5V21"/>
+</svg>
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