feat: java 코딩테스트 패키지 추가

Author: seunggulee1007

src/main/java/sgyj/javacodingtestktw/seunggu/Main.java

@@ -0,0 +1,3 @@
+package sgyj.javacodingtestktw.seunggu;
+
+public class Main {}

src/main/java/sgyj/javacodingtestktw/yeji/Main.java

@@ -0,0 +1,3 @@
+package sgyj.javacodingtestktw.yeji;
+
+public class Main {}