Add a function to create tables.

src/main/blog/db.cljs

@@ -14,3 +14,7 @@
   [client]
   (. client connect))
 
+(defn create-tables
+  [client]
+  (. client query "CREATE TABLE IF NOT EXISTS articles (id SERIAL PRIMARY KEY, title VARCHAR(255) NOT NULL, content TEXT NOT NULL, created TIMESTAMP DEFAULT CURRENT_TIMESTAMP);"))
+