add dummy model

models/go.mod

@@ -0,0 +1,3 @@
+module github.com/kAvEh--/HackerRank-Go/models
+
+go 1.23.0

models/users.go

@@ -0,0 +1,43 @@
+package models
+
+type User struct {
+	ID       int    `json:"id"`
+	Username string `json:"username"`
+	Password string `json:"password"`
+	Name     string `json:"name"`
+}
+
+type UserRepo interface {
+	Get(id int) (*User, error)
+	GetByUsername(username string) (*User, error)
+	Create(user *User) error
+	Update(user *User) error
+	Delete(id int) error
+}
+
+type userRepo struct {
+}
+
+func NewUserRepo() UserRepo {
+	return &userRepo{}
+}
+
+func (r *userRepo) Get(id int) (*User, error) {
+	return nil, nil
+}
+
+func (r *userRepo) GetByUsername(username string) (*User, error) {
+	return nil, nil
+}
+
+func (r *userRepo) Create(user *User) error {
+	return nil
+}
+
+func (r *userRepo) Update(user *User) error {
+	return nil
+}
+
+func (r *userRepo) Delete(id int) error {
+	return nil
+}