add cpprestsdk project to sln
add cpprestsdk project to sln

CloudXNS/LDNS-Selector-Windows,CloudXNS/LDNS-Selector-Windows,CloudXNS/LDNS-Selector-Windows,CloudXNS/LDNS-Selector-Windows,CloudXNS/LDNS-Selector-Windows,CloudXNS/LDNS-Selector-Windows