Create CONTRIBUTING.md

Related: TYPO3-Documentation/T3DocTeam#50

CONTRIBUTING.md

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+# Contribute to TYPO3 Documentation
+
+## Create Issues
+
+* If you find something missing or something is wrong in this manual, you are welcome to write an issue describing the problem. 
+* If you can, please try to fix the problem yourself. 
+* For minor changes, it is not necessary to create an issue first. 
+
+## Make changes (create pull requests)
+
+* In order to make changes on a [rendered page](https://docs.typo3.org/typo3cms/ExtbaseFluidBook/), just click on "Edit me on GitHub".
+* For a step-by-step walkthrough for making a change, see [Contribute to docs.typo3.org](https://docs.typo3.org/typo3cms/HowToDocument/WritingDocsOfficial/Index.html)
+* For a step-by-step walkthrough of alternative workflow, see [Local Editing and Rendering with Docker](https://docs.typo3.org/typo3cms/HowToDocument/WritingDocsOfficial/LocalEditing.html)
+
+## Get help
+
+* If you need help with contributing to the docs, see [How to get Help](https://docs.typo3.org/typo3cms/HowToDocument/HowToGetHelp.html)
+
+# Contribute to TYPO3 Core
+
+* See [TYPO3 Contribution Guide - Core Development](https://docs.typo3.org/typo3cms/ContributionWorkflowGuide/)
+
+# General TYPO3 Support
+
+If you have some general TYPO3 support questions or need help with TYPO3, please see https://typo3.org/help.