Make CONTRIBUTING.md nicer and more useful

CONTRIBUTING.md

@@ -1,18 +1,28 @@
 Contributing Patches and BDD Methodology
-----------------------------------------
+========================================
 
-Sylius is an open source, community-driven project.
-
-Sylius follows Behavior-Driven-Development practices and we suggest you
-to read dedicated part which explains how we work.
+Sylius is a Open Source project driven by the community. Join our amazing adventure and we promise to be nice and welcoming to everyone. Remember, you do not have to be a Symfony guru or even a programmer to help!
 
 You can learn [how to contribute the patches](http://docs.sylius.org/en/latest/contributing/code/patches.html)
 and [how we use Behat & PHPSpec](http://docs.sylius.org/en/latest/contributing/code/bdd.html)
 in two separate parts of our [Contributing Guide](http://docs.sylius.org/en/latest/contributing/index.html).
 
+PR Table Template
+-----------------
+
+```
+| Q             | A
+| ------------- | ---
+| Bug fix?      | no|yes
+| New feature?  | no|yes
+| BC breaks?    | no|yes
+| Deprecations? | no|yes
+| Fixed tickets | #X
+| License       | MIT
+| Doc PR        | Sylius/Sylius-Docs#X
+```
+
 Security Issues
 ---------------
 
-Sylius is not stable yet, but has been already used in production and we want
-to treat security very seriously. I decided to partially adopt the Symfony
-security procedures, you can read about it [here](http://docs.sylius.org/en/latest/contributing/code/security.html).
+Sylius is not stable yet, but has been already used in production and we treat security very seriously. You can read about security procedures [here](http://docs.sylius.org/en/latest/contributing/code/security.html).