[Crate] Add issue templates (#81)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report for a found bug
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Steps To Reproduce**
+Please provide the steps to reproduce the behavior (if not possible, describe as many details as possible).
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots or Data**
+If applicable, add screenshots/data to help explain your problem.
+
+**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 a feature
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**What is this feature about?**
+Shortly explain what your requested feature is about.
+
+**Additional context/references**
+Add any other context or references about the feature request here.

.github/ISSUE_TEMPLATE/help-regarding-code-protocol-errors.md

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+---
+name: Help regarding code/protocol errors
+about: Use this if you can't figure out how to use something.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**This issue shall be made only if you have already gone through the docs, have you done it?**
+Please state if there is something confusing regarding the docs (eg. location or wording).
+
+**What's you problem?**
+State as concise as possible what you want to do and can't do.
+
+**Suggestions to make this clearer**
+Mention how could stuff be improved so that someone doesn't have the same problem as you (eg. Error should give more information).