feat(docs): introduction of tree collection

docs/en-US/welcome/release/tree-collection.md

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+# Tree collection
+
+## Collection options
+
+```ts
+{
+  name: 'categories',
+  tree: 'adjacency-list',
+  fields: [
+    {
+      type: 'belongsTo',
+      name: 'parent',
+      treeParent: true,
+    },
+    {
+      type: 'hasMany',
+      name: 'children',
+      treeChildren: true,
+    },
+  ],
+}
+```
+
+## UI
+
+### Create tree collection
+
+<img src="./tree-collection/tree-collection.jpg">
+
+
+### Default fields
+
+<img src="./tree-collection/init.jpg">
+
+### Table block
+
+<img src="./tree-collection/tree-table.jpg">
+
+### Add child
+
+<img src="./tree-collection/add-child.jpg">
+
+### Expend/Collapse
+
+<img src="./tree-collection/expend-collapse.jpg">

docs/zh-CN/welcome/release/tree-collection.md

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+# Tree collection
+
+## Collection options
+
+```ts
+{
+  name: 'categories',
+  tree: 'adjacency-list',
+  fields: [
+    {
+      type: 'belongsTo',
+      name: 'parent',
+      treeParent: true,
+    },
+    {
+      type: 'hasMany',
+      name: 'children',
+      treeChildren: true,
+    },
+  ],
+}
+```
+
+## UI
+
+### Create tree collection
+
+<img src="./tree-collection/tree-collection.jpg">
+
+
+### Default fields
+
+<img src="./tree-collection/init.jpg">
+
+### Table block
+
+<img src="./tree-collection/tree-table.jpg">
+
+### Add child
+
+<img src="./tree-collection/add-child.jpg">
+
+### Expend/Collapse
+
+<img src="./tree-collection/expend-collapse.jpg">