add uni-notification-center collection

collection/uni-notification-center/collection.json

@@ -0,0 +1,38 @@
+{
+  "schema": {
+    "bsonType": "object",
+    "permission": {
+      "create": false,
+      "delete": false,
+      "read": "auth.uid == doc.user_id",
+      "update": false
+    },
+    "required": [
+      "user_id",
+      "content"
+    ],
+    "properties": {
+      "_id": {
+        "description": "ID，系统自动生成"
+      },
+      "title":{
+      	"description": "标题",
+        "bsonType": "string"
+      },
+      "content":{
+      	"description": "内容",
+        "bsonType": "string"
+      },
+      "user_id":{
+      	"description": "消息接收者的用户id"
+      },
+      "create_time":{
+      	"description": "创建时间",
+      	"forceDefaultValue":{
+      		"$env": "now"
+      	}
+      }
+    }
+  },
+  "index": []
+}

collection/uni-notification-center/package.json

@@ -0,0 +1,17 @@
+{
+  "name": "@opendb/uni-notification-center",
+  "version": "0.0.1",
+  "description": "uni-notification-center",
+  "keywords": ["消息中心"],
+  "opendb": {
+    "title": "统一消息中心",
+    "type": "collection",
+    "contributors": [
+      {
+        "name": "DCloud_JSON",
+        "email": "",
+        "homepage": ""
+      }
+    ]
+  }
+}