Added countries app with get views (filter view and get by alpha2 view)

solution/pulse/countries/views.py

@@ -0,0 +1,16 @@
+from rest_framework.generics import ListAPIView, RetrieveAPIView
+
+from countries.models import Country
+from countries.serializers import CountrySerializer
+
+
+class CountryListView(ListAPIView):
+    queryset = Country.objects.all().order_by("alpha2")
+    filterset_fields = ["region"]
+    serializer_class = CountrySerializer
+
+
+class CountryByAlpha2View(RetrieveAPIView):
+    queryset = Country.objects.all()
+    serializer_class = CountrySerializer
+    lookup_field = "alpha2"