Update README.md

Author: CESARDELATORRE

README.md

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 # eShopOnContainers - Microservices Architecture and Containers based Reference Application (**BETA state** - Visual Studio 2017 and CLI environments compatible)
 Sample .NET Core reference application, powered by Microsoft, based on a simplified microservices architecture and Docker containers. <p>
+**Note for Pull Requests**: We accept pull request from the community. When doing it, please do it onto the DEV branch which is the consolidated work-in-progress branch. Do not request it onto Master, if possible.
 
 > ### DISCLAIMER
 > **IMPORTANT:** The current state of this sample application is **BETA**, consider it version a 0.1 foundational version, therefore, many areas could be improved and change significantly while refactoring current code and implementing new features. **Feedback with improvements and pull requests from the community will be highly appreciated and accepted.**