[MRG+1] add github issues buttons (#316)

* add github issues buttons

* add blankline at end of file

Author: wdevazelhes

.github/issue_template.md .github/ISSUE_TEMPLATE/bug_report.md.github/issue_template.md renamed to .github/ISSUE_TEMPLATE/bug_report.md

@@ -1,3 +1,9 @@
+---
+name: Reproducible bug report
+about: Create a reproducible bug report. Not for support requests.
+labels: 'bug'
+---
+
 #### Description
 <!-- Describe your issue here.-->
 
@@ -42,3 +48,9 @@ $ pip show metric_learn | grep Version
 )
 -->
 <!-- Thanks for contributing! -->
+
+---
+<!-- Issue Author: Don't delete this message to encourage other users to support your issue! -->
+**Message from the maintainers**:
+
+Impacted by this bug? Give it a 👍. We prioritise the issues with the most 👍.

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,18 @@
+blank_issues_enabled: false
+
+contact_links:
+  - name: Have you read the docs?
+    url: http://contrib.scikit-learn.org/metric-learn/
+    about: Much help can be found in the docs
+  - name: Ask a question
+    url: https://github.com/sklearn-contrib/metric-learn/discussions/new
+    about: Ask a question or start a discussion about metric-learn
+  - name: Stack Overflow
+    url: https://stackoverflow.com
+    about: Please ask and answer metric-learn usage questions (API, installation...) on Stack Overflow
+  - name: Cross Validated
+    url: https://stats.stackexchange.com
+    about: Please ask and answer metric learning questions (use cases, algorithms & theory...) on Cross Validated
+  - name: Blank issue
+    url: https://github.com/sklearn-contrib/metric-learn/issues/new
+    about: Please note that Github Discussions should be used in most cases instead

.github/ISSUE_TEMPLATE/doc_improvement.md

@@ -0,0 +1,23 @@
+---
+name: Documentation improvement
+about: Create a report to help us improve the documentation. Alternatively you can just open a pull request with the suggested change.
+labels: Documentation
+---
+
+#### Describe the issue linked to the documentation
+
+<!--
+Tell us about the confusion introduced in the documentation.
+-->
+
+#### Suggest a potential alternative/fix
+
+<!--
+Tell us how we could improve the documentation in this regard.
+-->
+
+---
+<!-- Issue Author: Don't delete this message to encourage other users to support your issue! -->
+**Message from the maintainers**:
+
+Confused by this part of the doc too? Give it a 👍. We prioritise the issues with the most 👍.

.github/ISSUE_TEMPLATE/enhancement_proposal.md

@@ -0,0 +1,18 @@
+---
+name: Enhancement proposal
+about: Propose an enhancement for metric-learn
+labels: 'enhancement'
+---
+# Summary
+
+What change needs making?
+
+# Use Cases
+
+When would you use this?
+
+---
+<!-- Issue Author: Don't delete this message to encourage other users to support your issue! -->
+**Message from the maintainers**:
+
+Want to see this feature happen? Give it a 👍. We prioritise the issues with the most 👍.