Stage changes to implement postgres DB as well as initialise its state

migrations/20211105005738_create_subscriptions_table.sql

@@ -0,0 +1,8 @@
+-- Create Subscriptions Table
+CREATE TABLE Subscriptions(
+    id uuid NOT NULL,
+    PRIMARY KEY (id),
+    email TEXT NOT NULL UNIQUE,
+    name TEXT NOT NULL,
+    subscribed_at timestamptz NOT NULL
+);