adds new 'shop' table

lootalot_db/migrations/2019-06-10-123922_create_items/up.sql

@@ -13,3 +13,10 @@ CREATE TABLE looted (
   owner_id INTEGER NOT NULL,
   FOREIGN KEY (owner_id) REFERENCES players(id)
 );
+
+-- The items that are available in shop
+CREATE TABLE shop (
+  id INTEGER PRIMARY KEY NOT NULL,
+  name VARCHAR NOT NULL,
+  base_price INTEGER NOT NULL
+);