Add version informations to README.md

Author: steevanb

validation/mainRepository/README.md

@@ -4,15 +4,15 @@
   <a href="http://www.phpbenchmarks.com" target="_blank">www.phpbenchmarks.com</a>
 </p>
 
-## What is www.phpbenchmarks.com ?
+## 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 for Apache Bench and Siege, and PHP 5.6 to 7.3.
 
 Our benchmarking protocol is available on [benchmarking protocol page](http://www.phpbenchmarks.com/en/documentation/benchmarking-protocol).
 
-## What is this repository ?
+## What is this repository?
 
 It contains ____PHPBENCHMARKS_COMPONENT_NAME____ installation `only`.
 To reuse code between minor versions, features for benchmarks are not coded in this repository
@@ -30,3 +30,17 @@ See all ____PHPBENCHMARKS_COMPONENT_NAME____ benchmarked versions on [select ver
 ## 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 component (Symfony, Laravel, Twig etc) major version
+
+`X` Benchmarked component minor version
+
+`Y` Benchmarked component bugfix version
+
+`Z` Benchmark type: `1` Hello World, `3` REST API, `4` Templating small overload, `5` Templating big overload
+
+Note that all components do not have all benchmark types.