Add flow icon for app store category

Signed-off-by: Julius Härtl <jus@bitgrid.net>

core/css/icons.scss

@@ -486,6 +486,10 @@ img, object, video, button, textarea, input, select, div[contenteditable='true']
 	@include icon-color('search', 'actions', $color-black, 1, true);
 }
 
+.icon-category-workflow {
+	@include icon-color('workflow', 'categories', $color-black, 1, true);
+}
+
 .icon-talk {
 	@include icon-color('app-dark', 'spreed', $color-black, 1);
 }

core/img/categories/workflow.svg

@@ -0,0 +1 @@
+<svg width="16" height="16" version="1.1" viewbox="0 0 16 16" xmlns="http://www.w3.org/2000/svg"><path d="m3.084 3c-1.0027 0-1.834 0.83129-1.834 1.834v2.166h-0.23633c-1.3523-0.019125-1.3523 2.0191 0 2h0.23633v2.166c0 1.0027 0.83129 1.834 1.834 1.834h4.332c1.0027 0 1.834-0.83129 1.834-1.834v-2.166h3.3359l-1.7832 1.7832c-0.98163 0.94251 0.47151 2.3957 1.4141 1.4141l3.4902-3.4902c0.387-0.3878 0.391-1.0229 0-1.4141l-3.4902-3.4902c-0.1883-0.1935-0.4468-0.30271-0.7168-0.30273-0.8974 0-1.3404 1.0909-0.69727 1.7168l1.7832 1.7832h-3.3359v-2.166c0-1.0027-0.83129-1.834-1.834-1.834h-4.332zm0 1.5h4.332c0.19764 0 0.33398 0.13634 0.33398 0.33398v6.332c0 0.19764-0.13634 0.33398-0.33398 0.33398h-4.332c-0.19764 0-0.33398-0.13634-0.33398-0.33398v-6.332c0-0.19764 0.13634-0.33398 0.33398-0.33398z"/></svg>