added geo module, with region supporting gis data

geo/models.py

@@ -0,0 +1,77 @@
+from django.contrib.gis.db import models
+
+
+class Country(models.Model):
+    """
+    Country model
+    """
+    name = models.CharField(max_length = 100)
+
+    # internal
+    created = models.DateTimeField('date of creation', auto_now_add=True)
+    updated = models.DateTimeField('date last update', auto_now=True)
+
+    def __str__(self):
+        return f'{self.name}'
+
+    class Meta:
+        verbose_name = "País"
+        verbose_name_plural = "Paises"
+
+
+class Region(models.Model):
+    """
+    Region model
+    """
+    name = models.CharField(max_length=250)
+    country = models.ForeignKey(Country,on_delete=models.DO_NOTHING,related_name='regions')
+    geo = models.MultiPolygonField(null=True)
+
+    # internal
+    created = models.DateTimeField('date of creation', auto_now_add=True)
+    updated = models.DateTimeField('date last update', auto_now=True)
+
+    def __str__(self):
+        return f'{self.name} [{self.country}]'
+
+    class Meta:
+        verbose_name = "Región"
+        verbose_name_plural = "Regiones"
+
+
+class Province(models.Model):
+    """
+    Country model
+    """
+    name = models.CharField(max_length = 100)
+    region = models.ForeignKey(Region, on_delete=models.DO_NOTHING, related_name='province')
+
+    # internal
+    created = models.DateTimeField('date of creation', auto_now_add=True)
+    updated = models.DateTimeField('date last update', auto_now=True)
+
+    def __str__(self):
+        return f'{self.name} [{self.region}]'
+
+    class Meta:
+        verbose_name = "Provincia"
+        verbose_name_plural = "Provincias"
+
+
+class City(models.Model):
+    """
+    City model
+    """
+    name = models.CharField(max_length = 250)
+    province = models.ForeignKey(Province, on_delete=models.DO_NOTHING, related_name='city', null=True)
+
+    # internal
+    created = models.DateTimeField('date of creation', auto_now_add=True)
+    updated = models.DateTimeField('date last update', auto_now=True)
+
+    def __str__(self):
+        return f'{self.name} [{self.province}]'
+
+    class Meta:
+        verbose_name = "Municipio"
+        verbose_name_plural = "Municipios"