Added copyright header (#63)

Signed-off-by: artyom-yurin <[email protected]>

Author: ortyomka

src/multi/multibase_codec/codecs/base32.cpp

@@ -3,6 +3,30 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+/**
+ * base32 (de)coder implementation as specified by RFC4648.
+ *
+ * Copyright (c) 2010 Adrien Kunysz
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ **/
+
 #include <gsl/span>
 #include <libp2p/multi/multibase_codec/codecs/base32.hpp>
 #include <libp2p/multi/multibase_codec/codecs/base_error.hpp>