Add Ormin ORM support for BaraDB (Nim client)

clients/nim/ormin/examples/baradb_basic.nim

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+## Basic Ormin + BaraDB example
+##
+## Run with:
+##   nim c -r examples/baradb_basic.nim
+##
+## Requires a BaraDB server on localhost:9472.
+
+import ormin
+
+importModel(DbBackend.baradb, "baradb_model")
+
+let db {.global.} = open("127.0.0.1:9472", "admin", "", "default")
+
+proc listUsers() =
+  let rows = query:
+    select users(id, name, email)
+    orderby id
+  for r in rows:
+    echo "User #", r.id, ": ", r.name, " <", r.email, ">"
+
+proc findUserByName(name: string) =
+  let row = query:
+    select users(id, name, email)
+    where name == ?name
+    limit 1
+  echo "Found: ", row
+
+proc insertUser(name, email: string; age: int) =
+  query:
+    insert users(name = ?name, email = ?email, age = ?age)
+
+when isMainModule:
+  listUsers()
+  findUserByName("alice")
+  insertUser("bob", "bob@example.com", 30)