Update readme to include new CMake find_package() scripts

Author: ras0219-msft

README.md

@@ -29,26 +29,10 @@ To use from CMake:
 cmake_minimum_required(VERSION 3.7)
 project(main)
 
-find_path(CPPREST_INCLUDE cpprest/http_client.h)
-find_library(CPPREST_LIB NAMES cpprest_2_9d cpprest_2_9 cpprestd cpprest)
-find_package(Boost REQUIRED COMPONENTS random system thread filesystem chrono atomic date_time regex)
-find_package(OpenSSL 1.0.0 REQUIRED)
+find_package(cpprestsdk REQUIRED)
 
 add_executable(main main.cpp)
-target_include_directories(main ${CPPREST_INCLUDE})
-target_link_libraries(main
-  ${CPPREST_LIB}
-  Boost::boost
-  Boost::random
-  Boost::system
-  Boost::thread
-  Boost::filesystem
-  Boost::chrono
-  Boost::atomic
-  Boost::date_time
-  Boost::regex
-  OpenSSL::SSL
-)
+target_link_libraries(main PRIVATE cpprestsdk::cpprest)
 ```
 
 ## What's in the SDK: