Adding views and schema.

data/schema.sql

@@ -0,0 +1,8 @@
+drop table if exists cards;
+create table cards (
+  id integer primary key autoincrement,
+  type tinyint not null, /* 1 for vocab, 2 for code */
+  front text not null,
+  back text not null,
+  known boolean default 0
+);