ENH - Set Issue and PR templates (scikit-learn-contrib#190)

Author: Badr-MOUFAD

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+
+---
+
+# Describe the bug
+
+<!-- Concise description of the bug -->
+
+# Steps to reproduce
+
+<!-- You can provide a snippet that reproduces the bug -->
+
+
+**Additional context**
+
+<!-- Any extra information related to the bug (if any) -->

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+title: FEAT - Give a title to the feature request
+---
+
+# Description of the feature
+
+<!-- Describe the feature. for instance, is it related a problem? -->
+
+
+# Considered alternatives
+
+<!-- List the considered alternative (if any) -->
+
+
+**Additional context**
+
+<!-- Any extra information related to requested feature (if any) -->

.github/pull_request_template.md

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+# Context of the PR
+
+<!--
+
+Is the PR meant to fix a bug? implement a new feature...
+Any detail to be able to relate the PR changes
+
+-->
+
+# Contributions of the PR
+
+<!-- List the contribution of the PR -->
+
+
+### Checks before merging PR
+
+- [ ] added documentation for any new feature
+- [ ] added unittests
+- [ ] edited the [what's new](../doc/changes/whats_new.rst)(if applicable)