add pr and issue templates

Author: thijssteel

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: 'Type: Bug'
+assignees: ''
+
+---
+
+# 1. Bug description
+
+A description of the bug: what is the expected behaviour? What is the actual behaviour?
+
+# 2. Reproduction
+
+Try to provide as much information to reproduce the bug as possible. If possible, also include a minimal example that we can use reproduce the bug.
+
+# 3. Fix
+
+(Optional) Do you have any suggestions of how to fix the issue? Are you willing to make a PR to fix this issue?

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Request a feature
+title: ''
+labels: 'Type: Feature request'
+assignees: ''
+
+---
+
+# 1. Description of the feature
+
+A description of the bug: what is the expected behaviour? What is the actual behaviour?
+
+# 2. Why would it be beneficial
+
+Try to provide as much information to reproduce the bug as possible. If possible, also include a minimal example that we can use reproduce the bug.
+
+# 3. Implementation
+
+(Optional) Are you willing to implement (part) of this feature yourself?

.github/ISSUE_TEMPLATE/help_wanted.md

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+---
+name: Question
+about: Ask a question related to the use of the package
+title: ''
+labels: 'Type: Question'
+assignees: ''
+
+---
+
+# 1. The question
+
+A description of the bug: what is the expected behaviour? What is the actual behaviour?
+
+# 2. Your environment
+
+If you have a problem calling a LAPACK function we can usually help you faster if we know something about your environment. What programming language do you use? How do you compile and link your code?

.github/PULL_REQUEST_TEMPLATE.md

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+**Short description**
+
+Short description of the problem or link to related issue on github.
+
+**Technical description**
+
+(Optional) Description of the changes and why they work. For larger PR's, this might include a link to a scientific paper/LAWN.
+
+**Checklist**
+
+- [ ] The documententation has been updated
+- [ ] The tests have been updated
+- [ ] The changes have been applied to all the relevant precisions
+- [ ] If the PR solves a specific issue, it is set to be closed on merge.