added new linux folder

linux/gpio/GpioCookie.cpp

@@ -0,0 +1,26 @@
+#include "GpioCookie.h"
+#include <fsfw/serviceinterface/ServiceInterfaceStream.h>
+
+GpioCookie::GpioCookie() {
+}
+
+void GpioCookie::addGpio(gpioId_t gpioId, GpioConfig_t gpioConfig){
+	gpioMapIter = gpioMap.find(gpioId);
+	if(gpioMapIter == gpioMap.end()) {
+		std::pair status = gpioMap.emplace(gpioId, gpioConfig);
+		if (status.second == false) {
+			sif::error << "GpioCookie::addGpio: Failed to add GPIO "
+					<< gpioId << "to GPIO map" << std::endl;
+		}
+	}
+	else {
+		sif::error << "GpioCookie::addGpio: GPIO already exists in GPIO map "
+				<< std::endl;
+	}
+}
+
+GpioMap GpioCookie::getGpioMap() const{
+	return gpioMap;
+}
+
+GpioCookie::~GpioCookie() {}