Adds Store Service to control store settings (#76)

Also adds support for `projectConfig.admin_cors` & `projectConfig.store_cors`

packages/medusa/src/models/__mocks__/store.js

@@ -0,0 +1,17 @@
+import { IdMap } from "medusa-test-utils"
+
+export const store = {
+  _id: IdMap.getId("store"),
+  name: "test store",
+  currencies: ["DKK"],
+}
+
+export const StoreModelMock = {
+  create: jest.fn().mockReturnValue(Promise.resolve()),
+  updateOne: jest.fn().mockImplementation((query, update) => {
+    return Promise.resolve()
+  }),
+  findOne: jest.fn().mockImplementation(query => {
+    return Promise.resolve(store)
+  }),
+}

packages/medusa/src/models/store.js

@@ -0,0 +1,13 @@
+import mongoose from "mongoose"
+import { BaseModel } from "medusa-interfaces"
+
+class StoreModel extends BaseModel {
+  static modelName = "Store"
+  static schema = {
+    name: { type: String, required: true, default: "Medusa Store" },
+    currencies: { type: [String], default: [] },
+    metadata: { type: mongoose.Schema.Types.Mixed, default: {} },
+  }
+}
+
+export default StoreModel