Add basic README

.gitattributes

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+tests/ export-ignore
+.vscode/ export-ignore

README.md

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+# Async ORM
+
+Async ORM based on amphp.  
+
+Supports MySQL, Redis, Postgres.  
+
+Features read and write-back caching, type-specific optimizations, and much more!

tests/TestObject.php

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+<?php declare(strict_types=1);
+
+namespace danog\AsyncOrm\Test;
+
+use danog\AsyncOrm\DbObject;
+
+final class TestObject extends DbObject
+{
+    public int $loadedCnt = 0;
+    public int $saveAfterCnt = 0;
+    public int $saveBeforeCnt = 0;
+
+    public mixed $savedProp = null;
+
+    public function __sleep()
+    {
+        return ['savedProp'];
+    }
+
+    protected function onLoaded(): void
+    {
+        $this->loadedCnt++;
+    }
+    protected function onAfterSave(): void
+    {
+        $this->saveAfterCnt++;
+    }
+    protected function onBeforeSave(): void
+    {
+        $this->saveBeforeCnt++;
+    }
+}