Improvement of build workflow

[Galileo-Galilei]

• Add a template for bug report
• Add a template for feature request
• Add a template for pull request
• Improve test workflow:
  • rename dev in test
  • run tests on windows and macos
  • upload coverage report to Codecov
• Create a manual workflow to create a release candidate:
  • bump version automatically
  • update CHANGELOG according to 'Keep a changelog' principles
  • create branch and PR on master automatically
• Create a 'publish' workflow on merge on master:
  • create release
  • create tag
  • create PyPI release
  • merge back to develop
• Update README:
  • Add badges for readibility
  • Add credits to maintainers
  • Fix command for latest installation with pip
• Update CONTRIBUTING.md to explain the workflow for the release process
• Eventually add the markdown linter suggested by @kaemo (for linting in the test workflow? it may be worth it to add it to the precommit hook too) -> I had issues on the pre-commit on windows and it seems known and not fixed. Since we have windows users, I think we should let it go for now. Are you ok with this @kaemo?
• Update the CHANGELOG

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (develop@94bae3d). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop      #68   +/-   ##
==========================================
  Coverage           ?   96.68%           
==========================================
  Files              ?       32           
  Lines              ?     1177           
  Branches           ?        0           
==========================================
  Hits               ?     1138           
  Misses             ?       39           
  Partials           ?        0           

---

Continue to review full report at Codecov.

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[turn1a]

@Galileo-Galilei there's a great Markdown linter you might be interested in: https://github.com/DavidAnson/markdownlint

[turn1a]

Starting the review process.

[turn1a]

Only minor comments. Amazing work with this one!

[Galileo-Galilei]

When you confirm you are ok now, I'll rebase it locally.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (develop@94bae3d). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop      #68   +/-   ##
==========================================
  Coverage           ?   96.71%           
==========================================
  Files              ?       32           
  Lines              ?     1186           
  Branches           ?        0           
==========================================
  Hits               ?     1147           
  Misses             ?       39           
  Partials           ?        0           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 94bae3d...c917197. Read the comment docs.