Add MIT license.

LICENSE-MIT

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+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.

README.md

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+# fingertips: a simple search engine
+
+This repository contains some example code from the book “Programming Rust”, by
+Jim Blandy and Jason Orendorff. Specifically, this holds the full code for the
+text indexer sketched in Chapter 19, “Concurrency”.
+
+See the doc comments atop [main.rs] for a little more detail.
+
+## License
+
+The example code in this directory and its subdirectories is licensed under the
+terms of the MIT license. See [LICENSE-MIT] for details.
+
+[main.rs]: src/main.rs
+[LICENSE-MIT]: LICENSE-MIT