init_object,增加了不完全的登录API，完善数据库设计

src/main/java/com/guo/learningprogresstracker/domain/entity/CommonResult.java

@@ -0,0 +1,54 @@
+package com.guo.learningprogresstracker.domain.entity;
+
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class CommonResult<T> {
+    private Integer code;
+
+    private String message;
+
+    private T data;
+
+    public CommonResult(Integer code, String message){
+        this(code,message, null);
+    }
+
+    public static CommonResult<String> success(){
+        return new CommonResult(200,"请求成功",null);
+    }
+
+    public static CommonResult<String> success(String message){
+        return new CommonResult(200,message,null);
+    }
+
+    public static CommonResult<Object> success(String message,Object data){
+        return new CommonResult(200,"请求成功,"+message,data);
+    }
+
+    public static CommonResult success(Object data){
+        return new CommonResult(200,"请求成功",data);
+    }
+
+    public static CommonResult<String> error(String message){
+        return new CommonResult<>(400,message,null);
+    }
+
+    public static CommonResult<String> notFind(){
+        return new CommonResult<>(404,"请求的资源不存在",null);
+    }
+    public static CommonResult<String> notFind(String message){
+        return new CommonResult<>(404,message,null);
+    }
+
+    public static CommonResult<String> serverError(String message){
+        return new CommonResult<>(500,message,null);
+    }
+
+}