Created Announcement model and added admin view for the announcement board

widget_group_25/announcementboard/admin.py

 from django.contrib import admin
+from .models import Announcement
 
-# Register your models here.
+class AnnouncementAdmin(admin.ModelAdmin):
+    model = Announcement
+    list_display = ('announcement_title', 'announcement_body', 'pub_date')
+
+admin.site.register(Announcement, AnnouncementAdmin)
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widget_group_25/announcementboard/models.py

 from django.db import models
 
-# Create your models here.
+class Announcement(models.Model):
+    announcement_title = models.CharField(max_length=150)
+    announcement_body = models.TextField()
+    pub_date = models.DateField(auto_now=True)
+
+    def __str__(self):
+        return '"{}" published {}'.format(self.announcement_title, self.pub_date)
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