Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to CoreShop
+
+## Bug Reports & Feature Requests
+The CoreShop team heavily uses (and loves!) GitHub for all of our software management. 
+We use GitHub issues exclusively to track all bugs and features.
+
+* [Open an issue](https://github.com/coreshop/CoreShop/issues) here on GitHub. 
+If you can, **please provide a fix and create a pull request (PR) instead**; this will automatically create an issue for you.
+* Report security issues only to info@coreshop.org 
+* Please be patient as not all items will be tested immediately - remember, CoreShop is open source and free of charge. 
+* Occasionally we'll close issues if they appear stale or are too vague - please don't take this personally! 
+Please feel free to re-open issues we've closed if there's something we've missed and they still need to be addressed.
+
+## Contributing Pull Requests
+PR's are even better than issues. 
+We gladly accept community pull requests. 
+There are a few necessary steps before we can accept a pull request:
+
+* [Open an issue](https://github.com/coreshop/CoreShop/issues) describing the problem that you are looking to solve in 
+your PR (if one is not already open), and your approach to solving it (no necessary for bug fixes - only feature contributions). 
+* [Fork us!](https://help.github.com/articles/fork-a-repo/) Code! Follow the coding standards PSR-1 and PSR-2
+* [Send a pull request](https://help.github.com/articles/using-pull-requests/) from your fork’s branch to our `master` branch.
+
+### Contributor License Agreement
+The following terms are used throughout this agreement:
+
+* **You** - the person or legal entity including its affiliates asked to accept this agreement. An affiliate is any 
+entity that controls or is controlled by the legal entity, or is under common control with it.
+
+* **Project** - is an umbrella term that refers to any and all CoreShop projects.
+
+* **Contribution** - any type of work that is submitted to a Project, including any modifications or additions to 
+existing work.
+
+* **Submitted** - conveyed to a Project via a pull request, commit, issue, or any form of electronic, written, or 
+verbal communication with Pimcore, contributors or maintainers.
+
+#### 1. Grant of Copyright License.
+Subject to the terms and conditions of this agreement, You grant to the Projects’ maintainers, contributors, users and 
+to Pimcore a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, 
+prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Your contributions and such 
+derivative works. Except for this license, You reserve all rights, title, and interest in your contributions.
+
+#### 2. Grant of Patent License.
+Subject to the terms and conditions of this agreement, You grant to the Projects’ maintainers, contributors, users and 
+to Pimcore a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable (except as stated in this section) 
+patent license to make, have made, use, offer to sell, sell, import, and otherwise transfer your contributions, where 
+such license applies only to those patent claims licensable by you that are necessarily infringed by your contribution 
+or by combination of your contribution with the project to which this contribution was submitted. 
+
+If any entity institutes patent litigation - including cross-claim or counterclaim in a lawsuit - against You alleging 
+that your contribution or any project it was submitted to constitutes or is responsible for direct or contributory 
+patent infringement, then any patent licenses granted to that entity under this agreement shall terminate as of the 
+date such litigation is filed.
+
+#### 3. Source of Contribution.
+Your contribution is either your original creation, based upon previous work that, to the best of your knowledge, is 
+covered under an appropriate open source license and you have the right under that license to submit that work with 
+modifications, whether created in whole or in part by you, or you have clearly identified the source of the contribution 
+and any license or other restriction (like related patents, trademarks, and license agreements) of which you are 
+personally aware.