Add issue templates and pull request template (#142)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+---
+
+**Bug description**
+
+<!--A clear and concise description of what the bug is.-->
+
+**How to reproduce**
+
+<!--Steps to reproduce the behavior:-->
+
+-
+
+**Expected behavior**
+
+<!--A clear and concise description of what you expected to happen.-->
+
+**Additional details**
+
+<!--Please add context, links, reasons, screenshots, etc.-->

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an improvement or now feature
+title: ''
+labels: ''
+assignees: ''
+---
+
+**Context**
+
+<!--Please describe a proper context-->
+
+**Suggested solution**
+
+<!--Tell us what you would suggest-->
+
+**Considered alternatives**
+
+<!--Please add any alternative solutions that you have considered-->
+
+**Additional details**
+
+<!--Please add context, links, reasons, screenshots, etc.-->

.github/ISSUE_TEMPLATE/other.md

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+---
+name: Other
+about: Everything else
+title: ''
+labels: ''
+assignees: ''
+---

.github/pull_request_template.md

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+#### Changes
+
+- ...
+
+#### Checklist
+
+<!-- please check all items and add your own -->
+
+- [x] Read the contribution [guide](../CONTRIBUTING.md) and accept the [code](../CODE_OF_CONDUCT.md) of conduct
+- [ ] Readme (updated or not needed)
+- [ ] Tests (added, updated or not needed)