Update issue templates

Added templates for bug reports, feature requests and questions.

Author: MariusBrill

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: "[BUG] - *ENTER TITLE*"
+labels: bug
+assignees: ''
+
+---
+
+Please provide as much and as detailed information as possible as it will make it easier for us to reproduce and fix the bug!
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+A clear and concise description of how to reproduce the bug.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Your Setup:**
+- OS Grafana is running on:
+- OS & Browser from which Grafana is accessed:
+- Plugin-Version:
+- Grafana-Version:
+- Datasource & Version:
+- Other: 
+
+**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
+title: "[Feature] - *ENTER TITLE*"
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Ask a question about the project.
+title: "[Question] - *ENTER TITLE*"
+labels: question
+assignees: ''
+
+---
+
+**Write your question here**
+
+**Screenshots**
+
+**Where and how could we improve the readme?**