Dear sir.
I read your project description very carefully.
I've really rich experience in developing software using C++, c#, java, python and so on, so your project is very interesting to me.
I'm really confident about your project, and very eager to join it.
If you give me a chance, I'll do my best to provide wonderful result.
I believe this will be a good starting point of the business relation between us.
Looking forward to your response.
Thank you.