Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a bug
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+* Krotov version:
+* Python version:
+* Operating System:
+
+### Description
+
+Describe what you were trying to get done.
+Tell us what happened, what went wrong, and what you expected to happen.
+
+### What I Did
+
+```
+Paste the command(s) you ran and the output. Using markdown formatting
+If there was a crash, please include the traceback here.
+```
+Avoid screenshots. A great way to report a bug is to create a Jupyter notebook, upload it to http://gist.github.com and link it here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Ask a question
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+Is there something you cannot figure out how to do?
+
+* Krotov version:
+* Python version:
+* Operating System:
+
+Preferably, create a Jupyter notebook that illustrates what you're trying to do, upload it to http://gist.github.com, and link it here.

.github/ISSUE_TEMPLATE/related-software.md

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+---
+name: Related Software
+about: Report a related software project
+title: ''
+labels: documentation
+assignees: ''
+
+---
+
+The following project should be added to `krotov`'s documentation as "Related Software":
+
+**Project Name**:
+
+**Project URL**:
+
+**Programming Language**:
+
+**One-line project description**:
+
+How is the software related to `krotov`? Is it an implementation of optimal quantum control? If so which optimal control methods? If a new method, are there papers describing the method or its implementation?