Add USB stub, add logging using spdlog

src/Usb.cpp

@@ -0,0 +1,37 @@
+#include "Usb.hpp"
+
+#include <iostream>
+#include <iomanip>
+
+namespace ptprnt::driver {
+
+Usb::Usb() {
+    std::cout << "Usb starting" << std::endl;
+    libusb_init(NULL);
+}
+Usb::~Usb() {
+    std::cout << "Usb stopping" << std::endl;
+}
+
+std::vector<UsbDevice> Usb::listDevices() {
+    libusb_device ** devs;
+    libusb_device *dev;
+    struct libusb_device_descriptor desc;
+    int r,i=0;
+
+    libusb_get_device_list(NULL, &devs);
+
+    while ((dev=devs[i++]) != NULL) {
+		if ((r=libusb_get_device_descriptor(dev, &desc)) < 0) {
+			std::cerr << "failed to open device" << std::endl;
+			libusb_free_device_list(devs, 1);
+		}
+
+        std::cout << std::hex << std::setw(4) << desc.idVendor << ":" << desc.idProduct;
+        std::cout << std::endl;
+    }
+
+    return std::vector<UsbDevice>();
+}
+
+}  // namespace ptprnt::driver