Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Errors you encountered
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Error message**
+Error that was thrown (if available)
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Additional context**
+Add any other context about the problem here, like document types / preprocessing steps / settings of reader etc.
+
+**To Reproduce**
+Steps to reproduce the behavior
+
+**System:**
+ - OS: 
+ - GPU/CPU:
+ - Haystack version (commit or version number): 
+ - DocumentStore:
+ - Reader:
+ - Retriever:

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+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: Something unclear? Just ask :)
+title: ''
+labels: question
+assignees: ''
+
+---
+
+**Question**
+Put your question here
+
+**Additional context**
+Add any other context or screenshots about the question (optional).