Feat: Move type to type dir, and add main type enum.

src/main/kotlin/com/wafflestudio/csereal/core/admissions/type/AdmissionsMainType.kt

@@ -0,0 +1,21 @@
+package com.wafflestudio.csereal.core.admissions.type
+
+import com.wafflestudio.csereal.common.CserealException
+
+enum class AdmissionsMainType {
+    UNDERGRADUATE,
+    GRADUATE,
+    INTERNATIONAL;
+
+    fun toJsonValue() = this.name.lowercase()
+
+    companion object {
+        fun fromJsonValue(field: String) = try {
+            field
+                .uppercase()
+                .let { AdmissionsMainType.valueOf(it) }
+        } catch (e: IllegalArgumentException) {
+            throw CserealException.Csereal400("존재하지 않는 Admission Main Type입니다.")
+        }
+    }
+}

src/main/kotlin/com/wafflestudio/csereal/core/admissions/type/AdmissionsPostType.kt

@@ -0,0 +1,28 @@
+package com.wafflestudio.csereal.core.admissions.type
+
+import com.wafflestudio.csereal.common.CserealException
+
+enum class AdmissionsPostType {
+    // For graduate, undergraduate
+    EARLY_ADMISSION,
+    REGULAR_ADMISSION,
+
+    // For international
+    UNDERGRADUATE,
+    GRADUATE,
+    EXCHANGE_VISITING,
+    SCHOLARSHIPS;
+
+    fun toJsonValue() = this.name.lowercase()
+
+    companion object {
+        fun fromJsonValue(field: String) =
+            try {
+                field.replace('_', '-')
+                    .uppercase()
+                    .let { AdmissionsPostType.valueOf(it) }
+            } catch (e: IllegalArgumentException) {
+                throw CserealException.Csereal400("잘못된 Admission Post Type이 주어졌습니다.")
+            }
+    }
+}