Add Flux from() and filter() methods

Signed-off-by: davidarendsen <davidarendsen@hey.com>

tests/QueryBuilderTest.php

@@ -0,0 +1,39 @@
+<?php
+declare(strict_types=1);
+
+use PHPUnit\Framework\TestCase;
+use Arendsen\FluxQueryBuilder\QueryBuilder;
+
+final class QueryBuilderTest extends TestCase {
+
+    /**
+     * @dataProvider somethingProvider
+     */
+    public function testSomething($bucket, $measurement, $range, $expectedQuery)
+    {
+        $queryBuilder = new QueryBuilder();
+        $queryBuilder->from($bucket)
+            ->fromMeasurement($measurement)
+			->addRangeStart($range);
+
+        $this->assertEquals($queryBuilder->build(), $expectedQuery);
+    }
+
+    public function somethingProvider(): array
+    {
+        return [
+            'case 1' => [
+                [
+                    'bucket' => 'example-bucket', 
+                    'host' => 'host', 
+                    'org' => 'example-org', 
+                    'token' => 'token'
+                ],
+                'test_measurement',
+                '-360h',
+                'from(bucket: "test_bucket", host: "host", org: "example-org", token: "token") |> '
+            ],
+        ];
+    }
+
+}