[comp] add CardCollapse component

app/src/components/CardCollapse.vue

@@ -0,0 +1,80 @@
+<template>
+  <b-card
+    v-bind="$attrs"
+    no-body header-tag="h3" :class="_class"
+  >
+    <slot name="header" slot="header">
+      <b-button v-b-toggle="id" :variant="variant" class="card-collapse-button">
+        {{ title }}
+        <icon class="ml-auto" iname="chevron-right" />
+      </b-button>
+    </slot>
+
+    <b-collapse :id="id" :visible="visible" role="region">
+      <slot name="default" />
+    </b-collapse>
+  </b-card>
+</template>
+
+<script>
+export default {
+  name: 'CollapseCard',
+
+  props: {
+    id: { type: String, required: true },
+    title: { type: String, required: true },
+    variant: { type: String, default: 'white' },
+    visible: { type: Boolean, default: true },
+    flush: { type: Boolean, default: false }
+  },
+
+  computed: {
+    _class () {
+      const baseClass = 'card-collapse'
+      return [
+        baseClass,
+        {
+          [`${baseClass}-flush`]: this.flush,
+          [`${baseClass}-${this.variant}`]: this.variant
+        }
+      ]
+    }
+  }
+}
+</script>
+
+<style lang="scss" scoped>
+.card-collapse {
+  .card-header {
+    padding: 0;
+  }
+
+  &-button {
+    display: flex;
+    width: 100%;
+    text-align: left;
+    padding-top: $spacer * .5;
+    padding-bottom: $spacer * .5;
+    border-radius: 0;
+    font: inherit
+  }
+
+  &-flush {
+    border-radius: 0;
+    border-left: 0;
+    border-right: 0;
+  }
+
+  & + & {
+    margin-top: 0;
+    border-top: 0;
+  }
+
+  @each $color, $value in $theme-colors {
+    &-#{$color} {
+      background-color: $value;
+      color: color-yiq($value);
+    }
+  }
+}
+</style>