完成两个类的创建 (#333)

完成两个类的创建 (#333)

Author: freetie

src/main/java/com/github/hcsp/pet1/Cat.java

@@ -0,0 +1,4 @@
+package com.github.hcsp.pet1;
+
+public class Cat {
+}

src/main/java/com/github/hcsp/pet2/Dog.java

@@ -0,0 +1,4 @@
+package com.github.hcsp.pet2;
+
+public class Dog {
+}