conversion: liters to US gallons (#1255)

Conversions/LitersToUSGallons.js

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+/**
+ * This function converts liters to US gallons
+ * https://en.wikipedia.org/wiki/Gallon
+ * @constructor
+ * @param {number} liters - Amount of liters to convert to gallons
+ */
+const litersToUSGallons = (liters) => {
+  return liters / 3.785411784
+}
+
+export default litersToUSGallons

Conversions/test/LitersToUSGallons.test.js

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+import litersToUSGallons from '../LitersToUSGallons'
+
+test('Convert 50 liters to US gallons', () => {
+  expect(parseFloat(litersToUSGallons(50).toFixed(2))).toBe(13.21)
+})