Add README.

Author: twalmsley

README.md

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+# MODL Interpreter in TypeScript
+
+This repository contains an implementation of a [MODL](https://www.modl.uk/) interpreter in TypeScript.
+
+## Installation With NPM
+
+Use `npm install --save modl-interpreter`
+
+## TypeScript Example
+
+```TypeScript
+import { Interpreter } from './modl-interpreter/Interpreter';
+
+const interpreter = new Interpreter();
+
+const jsonString = interpreter.interpretToJsonString('x = a MODL string');
+
+console.log(jsonString);
+```
+
+This example produces the output:
+```json
+{"x":"a MODL string"}
+```
+
+## JavaScript Example
+
+```JavaScript
+const modl = require('modl-interpreter');
+
+const jsonString = modl.interpreter.interpretToJsonString('x = a MODL string');
+
+console.log(jsonString);
+```
+This example produces the same output as above.