Add MajorGraduationRequirement model (#875)

apps/planner/models.py

@@ -1,3 +1,20 @@
 from django.db import models
+from django.core.validators import MinValueValidator, MaxValueValidator
 
-# Create your models here.
+from apps.subject.models import Department
+
+class MajorGraduationRequirement(models.Model):
+    class MajorType(models.TextChoices):
+        MAJOR = "major"                             # 주전공
+        DOUBLE_MAJOR = "double_major"               # 복수전공
+        MINOR = "minor"                             # 부전공
+        SPECIALIZED_MAJOR = "specialized_major"     # 심화전공
+        SELF_DESIGNED_MAJRO = "self_designed_major" # 융합전공
+
+    department = models.ForeignKey(Department)
+    entrance_from = models.IntegerField(validators=[MinValueValidator(1900), MaxValueValidator(9999)])
+    entrance_to = models.IntegerField(validators=[MinValueValidator(1900), MaxValueValidator(9999)])
+    major_type = models.CharField(choices=MajorType.choices)
+    mandatory_major = models.IntegerField(validators=[MinValueValidator(0), MaxValueValidator(200)])
+    elective_major = models.IntegerField(validators=[MinValueValidator(0), MaxValueValidator(200)])
+    elective_basic = models.IntegerField(validators=[MinValueValidator(0), MaxValueValidator(200)])