to learn workflow core
github link: https://github.com/zhenl/ZL.WorflowCoreDemo/tree/master/ZL.WorflowCoreDemo
tutorial link is from: https://www.jianshu.com/p/7844f2d01ad5 https://www.jianshu.com/p/d0f7e04c985b https://www.jianshu.com/p/2abfb5392b7e https://www.jianshu.com/p/b9101f772c99 https://www.jianshu.com/p/4b55b37a17d5 https://www.jianshu.com/p/7e481725eb4e https://www.jianshu.com/p/915c7b9ed63c https://www.jianshu.com/p/66eb457f9d88 https://www.jianshu.com/p/b25a82238aea https://www.jianshu.com/p/64d928d03179 https://www.jianshu.com/p/16363046035b https://www.jianshu.com/p/65e481838595 https://www.jianshu.com/p/331bbfb53fa2 https://www.jianshu.com/p/69db617921d0 https://www.jianshu.com/p/dfb7fa068066 https://www.jianshu.com/p/b52b7e22d124 https://www.jianshu.com/p/c5879769c28a https://www.jianshu.com/p/66c4dd6a3de4 https://www.jianshu.com/p/f85706a62f56 https://www.jianshu.com/p/9e1aba3e9166 https://www.jianshu.com/p/25c1eefd4d8d