Add Ormin ORM support for BaraDB (Nim client)

clients/nim/ormin/examples/chat/chat_model.sql

@@ -0,0 +1,19 @@
+create table if not exists users(
+  id integer primary key,
+  name varchar(20) not null,
+  password varchar(32) not null,
+  creation timestamp not null default (DATETIME('now')),
+  lastOnline timestamp not null default (DATETIME('now'))
+);
+
+/* Names need to be unique: */
+create unique index if not exists UserNameIx on users(name);
+
+create table if not exists messages(
+  id integer primary key,
+  author integer not null,
+  content varchar(1000) not null,
+  creation timestamp not null default (DATETIME('now')),
+
+  foreign key (author) references users(id)
+);