Add list timeline rendering functionality

the list name is missing; this is because the API request to get it is different
to the API request for receiving the list timeline, and is not yet implemented.

src/components/list_timeline/list_timeline.js

@@ -0,0 +1,23 @@
+import Timeline from '../timeline/timeline.vue'
+const ListTimeline = {
+  data () {
+    return {
+      listId: null
+    }
+  },
+  components: {
+    Timeline
+  },
+  computed: {
+    timeline () { return this.$store.state.statuses.timelines.list }
+  },
+  created () {
+    this.listId = this.$route.params.id
+    this.$store.dispatch('startFetchingTimeline', { timeline: 'list', listId: this.listId })
+  },
+  unmounted () {
+    this.$store.dispatch('stopFetchingTimeline', 'list')
+  }
+}
+
+export default ListTimeline