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/controller/LoginController.java

@@ -0,0 +1,29 @@
+package com.guo.learningprogresstracker.controller;
+
+import com.guo.learningprogresstracker.domain.entity.CommonResult;
+import com.guo.learningprogresstracker.domain.model.LoginBody;
+import com.guo.learningprogresstracker.exception.AppException;
+import com.guo.learningprogresstracker.service.LoginService;
+import org.springframework.web.bind.annotation.CrossOrigin;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RestController;
+
+import javax.annotation.Resource;
+
+/**
+ * @author guo
+ */
+@CrossOrigin
+@RestController
+public class LoginController {
+
+    @Resource
+    private LoginService loginService;
+
+    @PostMapping("/login")
+    public CommonResult<Object> login(@RequestBody LoginBody loginBody) throws AppException {
+        String token = loginService.login(loginBody.getUsername(),loginBody.getPassword());
+        return CommonResult.success("登录成功！",token);
+    }
+}