add github templates

Author: oallain

.github/ISSUE_TEMPLATE/plugin_request.md

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+---
+name: Plugin request
+about: Suggest a plugin to this project
+title: "[Request]"
+labels: 'request'
+assignees: ''
+
+---
+
+**Which plugin do you want to add?**
+Give all the information you think is useful.

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Ask a question
+title: "[Question]"
+labels: question
+assignees: ''
+
+---
+
+**My question**
+A clear and concise question.

.github/PULL_REQUEST_TEMPLATE.md

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+| Q             | A
+| ------------- | ---
+| New Plugin?   | yes/no
+| Doc?          | yes/no
+| Fixed issue   | #... <!-- #-prefixed issue number(s), if any -->
+| License       | MIT
+
+### Description
+
+This PR [briefly explain what it does]
+
+> In case this PR propose a new Plugin:
+
+- [ ] I have read [CONTRIBUTING.md](CONTRIBUTING.md)
+- [ ] My proposal plugin use [the template](plugins/_template.md)
+- [ ] I added my plugin to the [list on the readme](README.md#admin)
+- [ ] I allowed the edition of your PR from maintainers