Add readme to 'ts-and-js' sample folder.

Reltre · Reltre · commit 89f7608ee91c · 2018-10-26T14:38:52.000-07:00
diff --git a/js-and-ts/README.md b/js-and-ts/README.md
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+# TypeScript Sample: Mixing TypeScript and JavaScript
+
+## Overview 
+
+A sample of how to use the `allowJS` option to use both JavaScript and TypeScript together.
+A simple text formatter is provided, written in JavaScript. This formatter is then used
+within a TypeScript class to format a computation.
+
+To run this sample, you must have `node` installed. You can also use `ts-node` to run this directly
+without a compilation from TypeScript to JavaScript.
+
+## Running 
+
+```bash
+$ tsc robot.ts`
+$ node robot.js`
+```
