#2 some github metadata: codeowners, bug/feature/question template, r…

…elease notes template (heavily inspired by Enceladus) (#13)

.github/CODEOWNERS

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+* @Zejnilovic @dk1844 @benedeki @AdrianOlosutean

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+labels: 'bug, priority: undecided'
+
+---
+
+## Describe the bug
+A clear and concise description of what the bug is.
+
+## To Reproduce
+Steps to reproduce the behavior OR commands run:
+1. Go to '...'
+2. Use value '...'
+3. Run using
+4. See error
+
+## Expected behavior
+A clear and concise description of what you expected to happen.
+
+## Screenshots
+If applicable, add screenshots to help explain your problem.
+
+## Desktop (please complete the following information):
+ - OS: [e.g. iOS]
+ - Versions of libraries (Spark, Scala, ...)
+ - Version [e.g. 22]
+
+## Additional context
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+labels: 'feature, under discussion, priority: undecided'
+
+---
+
+## Background
+A clear and concise description of where the limitation lies.
+
+## Feature
+A description of the requested feature.
+
+## Example [Optional]
+A simple example if applicable.
+
+## Proposed Solution [Optional]
+Solution Ideas:
+1. 
+2. 
+3. 

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Ask a question
+labels: 'question, priority: undecided'
+
+---
+
+## Background [Optional]
+A clear explanation of the reason for raising the question. 
+This gives us a better understanding of your use cases and how we might accommodate them.
+
+## Question
+A clear and concise inquiry

.github/ISSUE_TEMPLATE/release_notes.md

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+---
+title: Add release notes for vX.Y.0
+name: Release Notes
+about: Create release notes
+labels: 'docs, priority: medium'
+
+---
+
+## Background
+With the release of vX.Y.0, we should add its release notes to the docs.