…aviereguiluz)This PR was squashed before being merged into the 2.7 branch (closes#7645).Discussion----------Adding a new article about "Creating a Bug Reproducer"It's very common for us to tell issue reportes to create a bug reproducer. We usually tell them *"fork the Symfony Standard edition and reproduce the bug"* ... but I don't like that and I'm sure that most people don't understand what we're talking about.I propose to add this article to explain as simple as possible what do we expect them to do, so we can link to this article in every issue of the Symfony code repo.---If you are thinking about merging this article with others of the "Contributing" section ... let's do that later. I want to change a lot of things here ... but let's do one thing at a time. Thanks!Commits-------b5a61ca Adding a new article about "Creating a Bug Reproducer"

* 2.7: (31 commits)  Fixed the RST syntax  Improve example context  [#5621] Enhancing example of using bundle config  [#7601] minor tweak  Update expiration.rst  Update expiration.rst  Update expiration.rst  Update expiration.rst  Minor reword and fixed the line length  Improve specification explanation  [#7664] minor wording tweak  Rewords and minor fixes  Add an explanation about «constraints» validation  [#7645] enumerate ordered list items implicitly  Adding a new article about "Creating a Bug Reproducer"  Fixed a syntax issue  Use backticks#7311 choice_value callback argument can be null  Fixed broken links for nginx & FastCgiExternalServer  Update dialoghelper.rst  ...

* 2.8: (46 commits)  [#7507] fix component name  [#7490] minor typo fix  Added a note about redirections to absolute URLs in tests  Added the changes suggested by reviewers  [#7620] use generate() in PHP templates before 2.8  Fixed the RST syntax  Improve example context  [#5621] Enhancing example of using bundle config  [#7601] minor tweak  Update expiration.rst  Update expiration.rst  Update expiration.rst  Update expiration.rst  Minor reword and fixed the line length  Improve specification explanation  [#7664] minor wording tweak  Rewords and minor fixes  Add an explanation about «constraints» validation  [#7645] enumerate ordered list items implicitly  Adding a new article about "Creating a Bug Reproducer"  ...