add Cell component for init

src/components/cell-group/index.js

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+import CellGroup from '../cell/cell-group.vue';
+export default CellGroup;

src/components/cell/cell-group.vue

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+<template>
+
+</template>
+<script>
+    export default {
+        props: {
+
+        },
+
+    }
+</script>

src/components/cell/cell.vue

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+<template>
+
+</template>
+<script>
+    export default {
+        props: {
+
+        },
+
+    }
+</script>

src/components/cell/index.js

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+import Cell from './cell.vue';
+import CellGroup from './cell-group.vue';
+
+Cell.Group = CellGroup;
+export default Cell;