Adding issue templates (#138)

.github/issue_template/bug.md

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+---
+name: Inconsistency report
+about: Report a specification inconsistency to help us improve the snirf specification
+title: '[Inconsistency] '
+labels: 'help wanted'
+assignees: ''
+
+---
+
+**Describe the inconsistency**
+Describe what is inconsistent in the snirf specification. Note that we do not provide help or support for toolboxes.
+
+**Current specification**
+Copy & paste from the current snirf specification.
+
+**Corrected specification**
+A suggestion how to change the snif specification to eliminate the reported inconsistency.
+
+**Additional context**
+Add any other context about the problem here.

.github/issue_template/question.md

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+---
+name: Asking a question / requesting help
+about: Ask the community for help or advice
+title: '[Question] '
+labels: 'question'
+assignees: ''
+
+---
+
+**Is your question related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**What specific question do you have?**
+A simple, one sentence question.
+
+**Describe solutions you've tried**
+A clear and concise description of what you have tried on your own already.
+
+**Additional context**
+Add any other context or screenshots about the question.

.github/issue_template/suggestion.md

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+---
+name: Suggestion request
+about: Suggest an idea for this project
+title: '[Suggestion] '
+labels: 'enhancement'
+assignees: ''
+
+---
+
+**Is your suggestion 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.