When writing a resignation letter, it's important to keep your resignation letter as simple, brief, and focused as possible. It should also be positive. Once you have made the decision to move on, there's no point in criticizing your employer or your job. Your letter of resignation should include information on when you are leaving. You can also let the employer know you appreciate your time with the company.
What to Include in Your Resignation Letter:
The fact that you are leaving and date when your resignation is effective.
Thanks to your employer for the opportunities you have had during your employment.
I'm going to include a link to a website that can show you some examples on how to construct your resignation letter, and some further helpful tips on what you might want to include.Samples