Added AGPL header

NfcKeyC.ino

@@ -1,3 +1,21 @@
+/*
+    Copyright (C) 2018  github.com/Sinitax
+
+    This file is part of NfcKey.
+
+    NfcKey is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    NfcKey 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with NfcKey.  If not, see <http://www.gnu.org/licenses/>.
+*/
 #include <SPI.h>
 #include <MFRC522.h>
 
@@ -118,4 +136,4 @@ uint16_t getpack(uint8_t* uid)
 	
 	p = (p ^ 0x5555) & 0xFFFF;
 	return (p & 0xFF00) >> 8 | (p & 0x00FF) << 8;
-}
+}