feat : status enum create

src/main/java/nextstep/courses/domain/Status.java

@@ -0,0 +1,17 @@
+package nextstep.courses.domain;
+
+public enum Status {
+
+    PREPARE("prepare"),
+    END("end"),
+    RECRUIT("recruit");
+
+    final String status;
+    Status(String status) {
+        this.status = status;
+    }
+
+    public String getStatus() {
+        return status;
+    }
+}