Update sample project and README

Makefile

@@ -111,7 +111,8 @@ fname = "tests/data/iris.arff"
 sample: ## Build sample
 	@echo ">>> Building Sample...";
 	@if [ -d ./sample/build ]; then rm -rf ./sample/build; fi
-	@cd sample && cmake -B build -S . -D CMAKE_BUILD_TYPE=Debug && cmake --build build -t bayesnet_sample
+	@cd sample && cmake -B build -S . -D CMAKE_BUILD_TYPE=Release -DCMAKE_TOOLCHAIN_FILE=${VCPKG_ROOT}/scripts/buildsystems/vcpkg.cmake && \
+	cmake --build build -t bayesnet_sample
 	sample/build/bayesnet_sample $(fname)
 	@echo ">>> Done";