added pgsql schema

app/data/packages.pgsql.sql

@@ -0,0 +1,8 @@
+CREATE TABLE packages (
+    id            SERIAL,
+    name          varchar(255) NOT NULL  UNIQUE , 
+    url           varchar(512) NOT NULL  UNIQUE ,
+    hits          integer NOT NULL  DEFAULT 0,
+    created_at    timestamp NOT NULL, 
+    updated_at    timestamp NOT NULL   
+);