Add a synopsis to README

README.md

@@ -11,4 +11,21 @@ Kosher Zmanim itself is a TS/JS port of the [KosherJava](https://github.com/Kosh
 $ npm install @hebcal/noaa
 ```
 
+## Synopsis
+```javascript
+import {GeoLocation, NOAACalculator} from '@hebcal/noaa';
+import {Temporal} from 'temporal-polyfill';
+
+const latitude = 39.73915;
+const longitude = -104.9847;
+const elevtion = 1636;
+const tzid = 'America/Denver';
+const gloc = new GeoLocation(null, latitude, longitude, elevtion, tzid);
+const plainDate = new Temporal.PlainDate(2020, 6, 5); // Friday June 5 2020
+const noaa = new NOAACalculator(gloc, plainDate);
+
+const zdt = noaa.getSunset();
+console.log(zdt.toString()); // '2020-06-05T20:32:57.848-06:00[America/Denver]'
+```
+
 ## [API Documentation](https://hebcal.github.io/api/noaa/index.html)