feat(people): Add organisation field to Person

See #1

people/migrations/0011_person_add_organisation.py

@@ -0,0 +1,26 @@
+# Generated by Django 2.2.10 on 2020-02-25 08:49
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('people', '0010_add_country_fields'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Organisation',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=255)),
+            ],
+        ),
+        migrations.AddField(
+            model_name='person',
+            name='organisation',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.PROTECT, related_name='members', to='people.Organisation'),
+        ),
+    ]

people/models.py

@@ -17,6 +17,14 @@ class User(AbstractUser):
     """
 
 
+class Organisation(models.Model):
+    """
+    Organisation to which a :class:`Person` belongs.
+    """
+    name = models.CharField(max_length=255,
+                            blank=False, null=False)
+
+
 class Person(models.Model):
     """
     A person may be a member of the BRECcIA core team or an external stakeholder.
@@ -76,6 +84,11 @@ class Person(models.Model):
     nationality = CountryField(blank=True, null=True)
 
     country_of_residence = CountryField(blank=True, null=True)
+    
+    organisation = models.ForeignKey(Organisation,
+                                     on_delete=models.PROTECT,
+                                     related_name='members',
+                                     blank=True, null=True)
 
     @property
     def relationships(self):