Hello,
You can lear creating wcf service from below posts
http://www.codeproject.com/Articles/576820/Basic-Step-by-Step-WCF-WebService
http://www.c-sharpcorner.com/UploadFile/dhananjaycoder/four-steps-to-create-first-wcf-service-for-beginners/
Once done you can consume ms crm SDK in wcf service to create data in ms crm application.
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