Added Ent and user model.

ent/schema/user.go

@@ -0,0 +1,31 @@
+package schema
+
+import (
+	"time"
+
+	"entgo.io/ent"
+	"entgo.io/ent/schema/field"
+)
+
+// User holds the schema definition for the User entity.
+type User struct {
+	ent.Schema
+}
+
+// Fields of the User.
+func (User) Fields() []ent.Field {
+	return []ent.Field{
+		field.String("username").
+			Unique(),
+		field.String("password").
+			Sensitive(),
+		field.Time("created_at").
+			Default(time.Now).
+			Immutable(),
+	}
+}
+
+// Edges of the User.
+func (User) Edges() []ent.Edge {
+	return nil
+}