Add templates for PRs/issues

.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'
+
+---
+
+#### Describe the bug
+A clear and concise description of what the bug is.
+
+#### To Reproduce
+Steps to reproduce the behavior:
+```
+Minimum working example of code
+```
+
+#### Expected behavior
+A clear and concise description of what you expected to happen.
+
+#### Python environement:
+ - LumiSpy version: 0.x.x
+ - HyperSpy version: 1.x.x
+ - Python version: 3.x
+
+#### Additional context
+Add any other context about the problem here. If necessary, add screenshots to help explain your problem.

.github/ISSUE_TEMPLATE/custom.md

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+---
+name: Custom issue template
+about: Describe this issue template's purpose here.
+title: ''
+labels: ''
+---
+
+

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: 'type: feature request'
+assignees: ''
+
+---
+
+#### Describe the functionality you would like to see.
+A clear and concise description of what you would like to do.
+
+#### Describe the context
+Do you want to extend existing functionalities, what types of signals should it apply to, etc.
+
+#### Additional information
+Add any other context or screenshots about the feature request here.

.github/PULL_REQUEST_TEMPLATE.md

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+### Requirements
+* Read the [contributing guidelines](https://github.com/hyperspy/holospy/blob/main/.github/CONTRIBUTING.md).
+* Fill out the template; it helps the review process and it is useful to summarise the PR.
+* This template can be updated during the progression of the PR to summarise its status. 
+
+*You can delete this section after you read it.*
+
+### Description of the change
+A few sentences and/or a bulleted list to describe and motivate the change:
+- Change A.
+- Change B.
+- etc.
+
+### Progress of the PR
+- [ ] Change implemented (can be split into several points),
+- [ ] docstring updated (if appropriate),
+- [ ] update user guide (if appropriate),
+- [ ] added tests,
+- [ ] added line to CHANGES.rst,
+- [ ] ready for review.
+
+### Minimal example of the bug fix or the new feature
+```python
+import holospy as holo
+import numpy as np
+s = holo.signals.HologramImage(np.arange(100).reshape(10,10))
+# Your new feature...
+```
+
+