Setup store to hold databases.

src/morethantext/mod.rs

@@ -1,4 +1,5 @@
 mod cache;
+mod database;
 mod error;
 mod store;
 
@@ -8,6 +9,7 @@ use async_std::{
     task::spawn,
 };
 use cache::Cache;
+use database::Database;
 use error::{ErrorCode, MTTError};
 use store::Store;