Add docs

docs/src/.vuepress/theme/global-components/CodeGroup.vue

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+<template>
+  <div class="theme-code-group">
+    <div class="theme-code-group__nav">
+      <ul class="theme-code-group__ul">
+        <li
+          v-for="(tab, i) in codeTabs"
+          :key="tab.title"
+          class="theme-code-group__li"
+        >
+          <button
+            class="theme-code-group__nav-tab"
+            :class="{
+              'theme-code-group__nav-tab-active': i === activeCodeTabIndex,
+            }"
+            @click="changeCodeTab(i)"
+          >
+            {{ tab.title }}
+          </button>
+        </li>
+      </ul>
+    </div>
+    <slot />
+    <pre
+      v-if="codeTabs.length < 1"
+      class="pre-blank"
+    >// Make sure to add code blocks to your code group</pre>
+  </div>
+</template>
+
+<script>
+export default {
+  name: 'CodeGroup',
+  data () {
+    return {
+      codeTabs: [],
+      activeCodeTabIndex: -1
+    }
+  },
+  watch: {
+    activeCodeTabIndex (index) {
+      this.codeTabs.forEach(tab => {
+        tab.elm.classList.remove('theme-code-block__active')
+      })
+      this.codeTabs[index].elm.classList.add('theme-code-block__active')
+    }
+  },
+  mounted () {
+    this.codeTabs = (this.$slots.default || []).filter(slot => Boolean(slot.componentOptions)).map((slot, index) => {
+      if (slot.componentOptions.propsData.active === '') {
+        this.activeCodeTabIndex = index
+      }
+
+      return {
+        title: slot.componentOptions.propsData.title,
+        elm: slot.elm
+      }
+    })
+
+    if (this.activeCodeTabIndex === -1 && this.codeTabs.length > 0) {
+      this.activeCodeTabIndex = 0
+    }
+  },
+  methods: {
+    changeCodeTab (index) {
+      this.activeCodeTabIndex = index
+    }
+  }
+}
+</script>
+
+<style lang="stylus" scoped>
+  .theme-code-group {}
+  .theme-code-group__nav {
+    margin-bottom: -35px;
+    background-color: $codeBgColor;
+    padding-bottom: 22px;
+    border-top-left-radius: 6px;
+    border-top-right-radius: 6px;
+    padding-left: 10px;
+    padding-top: 10px;
+  }
+  .theme-code-group__ul {
+    margin: auto 0;
+    padding-left: 0;
+    display: inline-flex;
+    list-style: none;
+  }
+  .theme-code-group__li {}
+  .theme-code-group__nav-tab {
+    border: 0;
+    padding: 5px;
+    cursor: pointer;
+    background-color: transparent;
+    font-size: 0.85em;
+    line-height: 1.4;
+    color: rgba(255, 255, 255, 0.9);
+    font-weight: 600;
+  }
+  .theme-code-group__nav-tab-active {
+    border-bottom: #42b983 1px solid;
+  }
+  .pre-blank {
+    color: #42b983;
+  }
+</style>