add @constructor

README_EN.md

@@ -180,7 +180,6 @@ The `@log` does not use mixed or wrapper, but directly uses macro to generate de
     - `io.github.dreamylost.LogType.Slf4j` use `org.slf4j.Logger`
   - Support `class`, `case class` and `object`.
 
-
 > IDE support is not very good, a red prompt will appear, but the compilation is OK. You need to provide their dependencies and configuration, please refer to the test.
 
 - Example
@@ -212,6 +211,34 @@ The `@apply` used to generate `apply` method for primary construction of ordinar
 println(B2(1, 2))
 ```
 
+## @constructor
+
+The `@constructor` used to generate secondary constructor method for classes.
+
+- Note
+  - `verbose` Whether to enable detailed log.
+  - `excludeFields` Whether to exclude the specified `var` fields, default is `Nil`.
+  - Only support `class`.
+  - Currying is not supported for constructors at present.
+  - When used with `@toString`, it must be put last. Known problems.
+
+> IDE support is not very good, a red prompt will appear, but the compilation is OK. You need to provide their dependencies and configuration, please refer to the test.
+
+- Example
+
+```scala
+@constructor(excludeFields = Seq("c"))
+class A2(int: Int, val j: Int, var k: Option[String] = None, t: Option[Long] = Some(1L)) {
+  private val a: Int = 1
+  var b: Int = 1 //The default value of the field is not carried to the apply parameter, so all parameters are required.
+  protected var c: Int = _
+
+  def helloWorld: String = "hello world"
+}
+
+println(new A2(1, 2, None, None, 100))
+```
+
 # How to use
 
 Add library dependency