Update README.md

README.md

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-# symfony
+<p align="center">
+  <img src="http://www.phpbenchmarks.com/images/logo_github.png">
+  <br>
+  <a href="http://www.phpbenchmarks.com" target="_blank">www.phpbenchmarks.com</a>
+</p>
+
+## What is www.phpbenchmarks.com ?
+
+You will find lot of benchmarks for PHP frameworks, ORM and libs here.
+
+You can compare results between Apache Bench and Siege, PHP 5.6 to 7.2 and versions of your favorites PHP code.
+
+## What is this repository ?
+
+It's benchmark bundles for almost all Symfony versions.
+
+You can find how we benchmark it [here](http://www.phpbenchmarks.com/en/benchmark-protocol).
+
+## Symfony
+
+You can find all Symfony benchmarks [here](http://www.phpbenchmarks.com/fr/benchmark/apache-bench/php-7.1/select-version/symfony.html);