Add todoapp benchmark

bench/implementations/react-15.3.1-optimized/readme.md

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+# React TodoMVC for Benchmarking
+
+This is an update of the React TodoMVC example to use React 15.1 and
+precompiled/minified JSX instead of the slow JSXTransformer. The idea is that
+this is a reasonable approximation of the performance characteristics of modern
+production React code.
+
+This is not a perfect reflection of React best practices, because there is no
+such thing. If you ask five professional React users what current React best
+practices are, you'll get five different answers—each of which will benchmark
+differently. React Router, Immutable.js, Redux (with or without sagas), Ramda,
+ES2015 (with various Babel plugins), Webpack...the list never ends.
+
+Rather than wading into that combinatorial explosion, this example is leaving
+the original React TodoMVC implementation's supporting stack alone, and only
+performing the following upgrades:
+
+* Upgrade to React 15.1
+* Move everything into one JSX file and precompile it with Babel
+* Minify with uglify
+
+If you're curious how it benchmarks with your particular stack, please fork
+this repo and find out!
+
+# Building
+
+1. `npm install`
+2. `npm run make`
+3. Open a local server (e.g. with `npm install -g http-server`) and open index.html
+
+