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

solution/pulse/countries/urls.py

@@ -0,0 +1,12 @@
+from django.urls import path
+
+import countries.views
+
+urlpatterns = [
+    path("", countries.views.CountryListView.as_view(), name="countries"),
+    path(
+        "<str:alpha2>/",
+        countries.views.CountryByAlpha2View.as_view(),
+        name="country_by_alpha2",
+    ),
+]