Add the unitConversion and test the github actions with php 8.0

src/UnitConversionsClass.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace WeightConversion\UnitConversions;
+
+class UnitConversionsClass
+{
+    public static $grams;
+
+    public static function convert($grams)
+    {
+        return (new static($grams))->toKilograms();
+    }
+
+    public function __construct($grams)
+    {
+        self::$grams = $grams;
+    }
+
+    public function toKilograms()
+    {
+        return self::$grams / 1000;
+    }
+}

tests/ExampleTest.php

@@ -1,5 +1,12 @@
 <?php
 
+use WeightConversion\UnitConversions\UnitConversionsClass;
+
 it('can test', function () {
     expect(true)->toBeTrue();
 });
+
+
+it('1000 grams is equal to 1 kilogram', function () {
+    expect(UnitConversionsClass::convert(1000))->toEqual(1);
+});