feat: add project started date to person questions

Resolves #60

people/migrations/0038_project_started_date.py

@@ -0,0 +1,23 @@
+# Generated by Django 2.2.10 on 2021-03-01 19:16
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('people', '0037_alternate_filter_text'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='personanswerset',
+            name='project_started_date',
+            field=models.DateField(null=True),
+        ),
+        migrations.AlterField(
+            model_name='personquestion',
+            name='answer_is_public',
+            field=models.BooleanField(default=True, help_text='Should answers to this question be considered public?'),
+        ),
+    ]