Add README.md

Author: steevanb

README.md

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+<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 and template engines on [phpbenchmarks.com](http://www.phpbenchmarks.com).
+
+Benchmarks results are available from PHP 5.6 to latest version.
+
+Our benchmarking protocol is available on [benchmarking protocol page](http://www.phpbenchmarks.com/en/documentation/benchmarking-protocol).
+
+## What is this repository?
+
+It contains Symfony installation `only`.
+To reuse code between minor versions, features for benchmarks are not coded in this repository
+but in [phpbenchmarks/symfony-common](https://github.com/phpbenchmarks/symfony-common) repository.
+
+Switch branch to select version and benchmark you want to see.
+
+## Benchmarks
+
+You can find Symfony 4.4 benchmarks results on
+[benchmarks results page](http://www.phpbenchmarks.com/en/benchmark/symfony/4.4).
+
+See all Symfony benchmarked versions on [select version page](http://www.phpbenchmarks.com/en/benchmark/symfony/version).
+
+## Community
+
+Go to [community page](http://www.phpbenchmarks.com/en/community) to see the Hall of fame, or download the benchmark kit to add your code!
+
+## How version works?
+
+We do not follow semantic version for this repository. Here is an explanation about our versioning system:
+
+`W` Benchmarked framework major version
+
+`X` Benchmarked framework minor version
+
+`Y` Benchmarked framework patch version
+
+`Z` Benchmark type: `1` Hello World, `3` REST API