Add license and README files

LICENSE

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+Copyright 2014-2018 Diomidis Spinellis
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.

README.md

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+[![Build Status](https://travis-ci.org/dspinellis/tokenizer.svg?branch=master)](https://travis-ci.org/dspinellis/tokenizer)
+
+# tokenizer
+
+Tokenize source code into integer vectors.