Adding first release of Pico CCID. It should be the core for different types of smart cards.

src/usb/usb_descriptors.h

@@ -0,0 +1,29 @@
+/* 
+ * This file is part of the Pico CCID distribution (https://github.com/polhenarejos/pico-ccid).
+ * Copyright (c) 2022 Pol Henarejos.
+ * 
+ * This program is free software: you can redistribute it and/or modify  
+ * it under the terms of the GNU General Public License as published by  
+ * the Free Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful, but 
+ * WITHOUT ANY WARRANTY; without even the implied warranty of 
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License 
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef USB_DESCRIPTORS_H_
+#define USB_DESCRIPTORS_H_
+
+enum
+{
+  VENDOR_REQUEST_WEBUSB = 1,
+  VENDOR_REQUEST_MICROSOFT = 2
+};
+
+extern uint8_t const desc_ms_os_20[];
+
+#endif /* USB_DESCRIPTORS_H_ */