Add a README file.

README.md

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+## Introduction
+The Tizen Extensions Crosswalk (t-e-c) implements the
+Tizen Web APIs (https://developer.tizen.org/documentation/web-api-reference)
+on top of the Crosswalk app runtime (https://crosswalk-project.org/) and
+its Extensions framework.
+
+This is an open source project started by the Intel Open Source Technology Center
+(http://www.01.org).
+
+## Documents
+Check out our [Wiki](https://github.com/crosswalk-project/tizen-extensions-crosswalk/wiki).
+
+## Coding Style
+JavaScript: We use Google's Closure Linter for checking our JavaScript coding sytle.
+It is used in --strict mode but with max_line_length set to 100 columns.
+Please ALWAYS run tools/js_lint.sh before submitting patches.
+
+C++: We use cpplint. Please ALWAYS run tools/check-coding-style before submitting patches.
+
+## License
+This project's code uses the BSD license, see our `LICENSE` file.