Added issue and PR templates

Author: Simon Hofmann

.github/ISSUE_TEMPLATE/bug.md

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+---
+name: Bug report
+about: Create a bug report to help us enhance our images
+---
+
+**Image**
+
+**Tag**
+
+**Short overview**
+
+**Detailed error description**
+
+**Additional content**
+> Please provide any (mandatory) additional data to reproduce the error (custom Dockerfiles etc.)

.github/ISSUE_TEMPLATE/feature.md

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+---
+name: Feature request
+about: Open a feature request 
+---
+
+**Short overview**
+
+**Use case**
+
+**Detailed feature description**
+
+**Additional content**
+> Please provide any (mandatory) additional data for your desired feature

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: File a request to resolve open questions
+---
+
+**Image**
+
+**Tag**
+
+**Short summary**
+
+**Detailed question**

.github/PULL_REQUEST_TEMPLATE/bugfix.md

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+---
+name: Bugfix
+about: Request to merge a bugfix to our existing images
+---
+
+**Short summary**
+
+**Detailed description (motivation, use-case etc.)**
+
+**Screenshots (if appropriate)**
+
+**Checklist**
+
+- [ ] My change requires a change to the documentation.
+- [ ] I have updated the documentation accordingly.

.github/PULL_REQUEST_TEMPLATE/enhancement.md

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+---
+name: Enhancement
+about: Request to merge an enhancement to our existing images
+---
+
+**Short summary**
+
+**Detailed description (motivation, use-case etc.)**
+
+**Screenshots (if appropriate)**
+
+**Checklist**
+
+- [ ] My change requires a change to the documentation.
+- [ ] I have updated the documentation accordingly.

.github/PULL_REQUEST_TEMPLATE/feature.md

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+---
+name: Feature
+about: Request to merge a new feature 
+---
+
+**Short summary**
+
+**Detailed description (motivation, use-case etc.)**
+
+**Screenshots (if appropriate)**
+
+**Checklist**
+
+- [ ] My change requires a change to the documentation.
+- [ ] I have updated the documentation accordingly.