Update issue templates

Adding templates for:
 - bug
 - feature
 - question

Author: vsoch

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve singularity python
+
+---
+
+## Expected Behavior
+
+[ Please describe the behavior that are expecting ]
+
+## Actual Behavior
+
+## Steps to Reproduce
+
+[ Please provide detailed steps for reproducing the issue and reproducible Code Snippet ]
+
+## Context
+
+[provide more detailed introduction to the issue itself . This is for make a reproducible issue.]
+* Operating System:
+* singularity version:
+* spython version:
+* python version:
+
+## Failure Logs
+
+ [ log or files here. If relevant, include a screenshot]
+
+## Possible Fix
+
+[ the suggest fixes or reasons for the bug]

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for singularity python
+
+---
+
+**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, or prompt an update of the docs
+
+---
+
+## What is your question?
+
+[write your question here, and answer the prompts below]
+
+ - [ ] I found the documentation at https://singularityhub.github.io/singularity-cli/
+ - [ ] The documentation does not answer my question
+
+If the documentation doesn't answer your question, where do you think it would be appropriate to add (i.e., where did you go looking for it?)