conversion: liters to imperial gallons (#1256)

* Added liters to imperial gallons conversion

* Fixed documentation @see

* Pr suggestion

Conversions/LitersToImperialGallons.js

@@ -0,0 +1,11 @@
+/**
+ * This function converts liters to imperial gallons
+ * @constructor
+ * @param {number} liters - Amount of liters to convert to gallons
+ * @see https://en.wikipedia.org/wiki/Gallon
+ */
+const litersToImperialGallons = (liters) => {
+  return liters / 4.54609
+}
+
+export default litersToImperialGallons

Conversions/test/LitersToImperialGallons.test.js

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+import litersToImperialGallons from '../LitersToImperialGallons'
+
+test('Convert 25 liters to imperial gallons', () => {
+  expect(parseFloat(litersToImperialGallons(25).toFixed(2))).toBe(5.5)
+})