Dear,sir
I have checked your job description very carefully and have generally understood about it.
I have been developed mobile apps for more than 5 years and I have special skills in iOS and Android app development.
So far I have touched nearly all parts of iOS and Android APIs.
I can start your project immediately and also I can work in full time for you.
If you give me a chance to serve you, I will provide a high quality product within the deadline.
I believe my skill and experience would be help for your project.
Anything of your requirements are welcome.
If you want, I can provide excellent graphic design, also.
I look forward to a long term relationship with you and I will try my best for it.
It would be happy to set up a convenient time to discuss in detail.
I am looking forward to hear something positive from you and working on this project.
thanks
Liu.