Update README.md

README.md

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 "software-only" nfc-tag-emulator (ISO 14443-3 "compatible" Type 2) for 8 bit microcontrollers
 
 Details to the circuit on http://blog.nonan.net/2013/11/simple-nfc.html
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+/*****************************************************************************
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+Licensed under the Apache License, Version 2.0 (the "License");
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+you may not use this file except in compliance with the License.
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+You may obtain a copy of the License at
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+
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+http://www.apache.org/licenses/LICENSE-2.0
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+
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+Unless required by applicable law or agreed to in writing, software
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+distributed under the License is distributed on an "AS IS" BASIS,
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+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+See the License for the specific language governing permissions and
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+limitations under the License.
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+*****************************************************************************/