add support for mfrc proxyies

uid.h

@@ -0,0 +1,24 @@
+#pragma once
+
+class Uid
+{
+public:
+	uint8_t size; // Number of bytes in the UID. 4, 7 or 10.
+	uint8_t uidByte[10];
+	uint8_t sak;  // The SAK (Select acknowledge) byte returned from the PICC after successful selection.
+	bool operator==(Uid& in)
+	{
+		if(size != in.size)
+			return false;
+		for(uint8_t i = 0; i < size; ++i)
+		{
+			if(uidByte[i] != in.uidByte[i])
+				return false;
+		}
+		return true;
+	}
+	bool operator!=(Uid& in)
+	{
+		return !operator==(in);
+	}
+};