chore: add some issue templates to github

Author: byCedric

.github/ISSUE_TEMPLATE/BUG_REPORT.md

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+---
+name: Bug report
+about: Create a report to help us improve
+---
+
+### Description of the bug
+How would you shortly summarise the issue?
+
+### To Reproduce
+What steps did you perform which led to this issue?
+
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+
+#### Expected behavior
+What did you expect to have happened?
+
+#### Actual behavior
+What did it actually result in?
+
+### Additional context
+Can you further explain the issue? E.g., information about version/environment or screenshots.

.github/ISSUE_TEMPLATE/DISCUSSION.md

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+---
+name: New discussion
+about: Start a discussion about a certain topic
+---
+
+### Topic and scope of discussion
+How would you summarise and scope the issue?
+
+### Motivation
+Why should we have this discussion?
+
+### Additional context
+Can you further explain the purpose of this discussion? E.g., screenshots or real-world examples.

.github/ISSUE_TEMPLATE/FEATURE_REQUEST.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+---
+
+### Description of the feature
+How would you briefly summarise the feature?
+
+### Motivation
+Why does this feature should be implemented?
+
+### Additional context
+Can you further explain the feature? E.g., screenshots or real-world examples.

.github/ISSUE_TEMPLATE/MINOR_CHANGE.md

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+---
+name: Minor changes
+about: Suggest a small change, or fix, like typos
+---
+
+#### Old version
+What did you find that should be changed?
+
+#### New version
+How should it look after the suggested change?
+
+### Additional context
+Can you further clarify the change? E.g., link to a dictionary or real-world examples.

.github/PULL_REQUEST_TEMPLATE.md

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+### Linked issue
+Provide the issue(s) which this pull request relates to or fixes.
+
+### Additional context
+Are there things the maintainers should be aware of before merging or closing this pull request?