Add a stub datomish.core for browser code.

src-browser/datomish/core.cljs

@@ -0,0 +1,13 @@
+;; This Source Code Form is subject to the terms of the Mozilla Public
+;; License, v. 2.0. If a copy of the MPL was not distributed with this
+;; file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+(ns datomish.core
+  (:require
+     [honeysql.format :as sql]
+     [datomish.db :as db]
+     [datomish.db-factory :as db-factory]
+     [datomish.js-sqlite :as js-sqlite]
+     [datomish.sqlite :as sqlite]
+     [datomish.transact :as transact]))
+