minor #25975 Added a README entry to the PR template (wouterj)
minor #25975 Added a README entry to the PR template (wouterj)

This PR was merged into the 2.7 branch.

Discussion
----------

Added a README entry to the PR template

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | -
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Recently, in the [Diversity Initiative post]() @fabpot mentioned: "A major version of a project should be about improving all aspects of it: community, docs, and code in this order of importance." Also, Symfony advocates that [“an undocumented line is a line that does not exist”](https://symfony.com/six-good-reasons).

This order of importance is not yet followed. Most of the resources are spent on the code, instead of the docs. And with good reason: there's a way bigger contributor base to take care of in the code, compared to the docs.

During a doc meeting this evening, @symfony/team-symfony-docs has discussed this problem. We think it can be improved by two pragmatic changes in the Code repository:

* Focus on creating a Doc PR before a feature is merged. We used to do this, but it seems to not be the case anymore.
* Add a `README` section to the PR template, as done by this PR. This readme section should contain a readme focused entry of the feature introduced by the PR. This has multiple advantages, among which: it helps the PR author to focus on usage ([Readme driven development](http://tom.preston-werner.com/2010/08/23/readme-driven-development.html)); it can function as a great bootstrap for the doc team; it helps reviewers to understand the PR more easily.

Of course, I've just created this PR to start the discussion. I'm happy to change all wording in the PR template.

Commits
-------

bc1b652b17 Added a README entry to the PR template

mnapoli/symfony,nasimnabavi/symfony,shieldo/symfony,nasimnabavi/symfony,voronkovich/symfony,dmaicher/symfony,tucksaun/symfony,mweimerskirch/symfony,vincentaubert/symfony,1ed/symfony,alekitto/symfony,curry684/symfony,Tobion/symfony,mnapoli/symfony,jderusse/symfony,1ed/symfony,tgalopin/symfony,dmaicher/symfony,HeahDude/symfony,shieldo/symfony,chalasr/symfony,apetitpa/symfony,oleg-andreyev/symfony,c960657/symfony,xabbuh/symfony,hhamon/symfony,iltar/symfony,bendavies/symfony,arjenm/symfony,c960657/symfony,Pierstoval/symfony,lstrojny/symfony,Deamon/symfony,lstrojny/symfony,apetitpa/symfony,jvasseur/symfony,hacfi/symfony,deguif/symfony,oleg-andreyev/symfony,damienalexandre/symfony,d-ph/symfony,nicolas-grekas/symfony,shieldo/symfony,sroze/symfony,yceruto/symfony,Taluu/symfony,dmaicher/symfony,curry684/symfony,mihai-stancu/symfony,teohhanhui/symfony,lyrixx/symfony,localheinz/symfony,frankdejonge/symfony,teohhanhui/symfony,Tobion/symfony,zorn-v/symfony,voronkovich/symfony,romaricdrigon/symfony,voronkovich/symfony,sroze/symfony,vincentaubert/symfony,pierredup/symfony,OndraM/symfony,teohhanhui/symfony,derrabus/symfony,fabpot/symfony,gimler/symfony,damienalexandre/symfony,Taluu/symfony,andreia/symfony,jakzal/symfony,smatyas/symfony,tucksaun/symfony,Deamon/symfony,MatTheCat/symfony,teohhanhui/symfony,mihai-stancu/symfony,ro0NL/symfony,Deamon/symfony,d-ph/symfony,andreia/symfony,maidmaid/symfony,derrabus/symfony,gimler/symfony,derrabus/symfony,Nyholm/symfony,Koc/symfony,nasimnabavi/symfony,pamil/symfony,alekitto/symfony,ragboyjr/symfony,iltar/symfony,Tobion/symfony,curry684/symfony,alekitto/symfony,joelwurtz/symfony,sgehrig/symfony,joelwurtz/symfony,Einenlum/symfony,symfony/symfony,docteurklein/symfony,xabbuh/symfony,chalasr/symfony,ro0NL/symfony,stof/symfony,bendavies/symfony,HeahDude/symfony,pyrech/symfony,smatyas/symfony,joelwurtz/symfony,mihai-stancu/symfony,andrerom/symfony,alekitto/symfony,phramz/symfony,damienalexandre/symfony,SpacePossum/symfony,Simperfit/symfony,OskarStark/symfony,Slamdunk/symfony,apetitpa/symfony,phramz/symfony,SaschaDens/symfony,arjenm/symfony,zcodes/symfony,gonzalovilaseca/symfony,zorn-v/symfony,sgehrig/symfony,Einenlum/symfony,Simperfit/symfony,pamil/symfony,kbond/symfony,hhamon/symfony,e-moe/symfony,hhamon/symfony,pierredup/symfony,michaelperrin/symfony,bendavies/symfony,ogizanagi/symfony,jakzal/symfony,deguif/symfony,SaschaDens/symfony,d-ph/symfony,tgalopin/symfony,SaschaDens/symfony,docteurklein/symfony,SpacePossum/symfony,Tobion/symfony,ogizanagi/symfony,Simperfit/symfony,weaverryan/symfony,gnat42/symfony,Taluu/symfony,Koc/symfony,d-ph/symfony,ajgarlag/symfony,HeahDude/symfony,OskarStark/symfony,nasimnabavi/symfony,yceruto/symfony,c960657/symfony,oleg-andreyev/symfony,lstrojny/symfony,zcodes/symfony,frankdejonge/symfony,romaricdrigon/symfony,maidmaid/symfony,symfony/symfony,docteurklein/symfony,ajgarlag/symfony,c960657/symfony,gnat42/symfony,voronkovich/symfony,xabbuh/symfony,zerkms/symfony,iltar/symfony,ro0NL/symfony,localheinz/symfony,romaricdrigon/symfony,e-moe/symfony,gonzalovilaseca/symfony,yceruto/symfony,zerkms/symfony,deguif/symfony,zcodes/symfony,zerkms/symfony,lyrixx/symfony,andreia/symfony,paradajozsef/symfony,OndraM/symfony,mnapoli/symfony,jean-gui/symfony,pamil/symfony,michaelperrin/symfony,jderusse/symfony,xabbuh/symfony,andrerom/symfony,Nyholm/symfony,nicolas-grekas/symfony,mweimerskirch/symfony,frankdejonge/symfony,fabpot/symfony,nicolas-grekas/symfony,sgehrig/symfony,Koc/symfony,mpdude/symfony,ro0NL/symfony,andrerom/symfony,Slamdunk/symfony,shieldo/symfony,sroze/symfony,smatyas/symfony,Taluu/symfony,Koc/symfony,1ed/symfony,tucksaun/symfony,deguif/symfony,paradajozsef/symfony,chalasr/symfony,arjenm/symfony,ogizanagi/symfony,zerkms/symfony,symfony/symfony,jean-gui/symfony,SpacePossum/symfony,zorn-v/symfony,smatyas/symfony,docteurklein/symfony,mihai-stancu/symfony,localheinz/symfony,romaricdrigon/symfony,weaverryan/symfony,gonzalovilaseca/symfony,ajgarlag/symfony,chalasr/symfony,andrerom/symfony,ragboyjr/symfony,phramz/symfony,mpdude/symfony,michaelperrin/symfony,fabpot/symfony,1ed/symfony,mweimerskirch/symfony,mpdude/symfony,e-moe/symfony,bendavies/symfony,docteurklein/symfony,joelwurtz/symfony,SaschaDens/symfony,dmaicher/symfony,OndraM/symfony,hacfi/symfony,Simperfit/symfony,Deamon/symfony,OskarStark/symfony,Pierstoval/symfony,Deamon/symfony,damienalexandre/symfony,apetitpa/symfony,jvasseur/symfony,garak/symfony,OndraM/symfony,OskarStark/symfony,sroze/symfony,Nyholm/symfony,Simperfit/symfony,garak/symfony,pyrech/symfony,Pierstoval/symfony,mweimerskirch/symfony,ajgarlag/symfony,derrabus/symfony,kbond/symfony,andreia/symfony,e-moe/symfony,HeahDude/symfony,ragboyjr/symfony,tgalopin/symfony,Einenlum/symfony,Slamdunk/symfony,ragboyjr/symfony,Einenlum/symfony,pyrech/symfony,michaelperrin/symfony,gimler/symfony,tucksaun/symfony,mweimerskirch/symfony,arjenm/symfony,paradajozsef/symfony,MatTheCat/symfony,zcodes/symfony,fabpot/symfony,paradajozsef/symfony,garak/symfony,stof/symfony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