Update issue templates

.github/ISSUE_TEMPLATE/issue-template.md

@@ -0,0 +1,21 @@
+---
+name: Issue template
+about: Please follow the template to create issues :)
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+# Problem
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+## Details
+Describe the solution you'd like.
+A clear and concise description of what you want to happen.
+
+## Acceptance criteria
+Describe what should be done in a pull request.
+
+## Next steps (optional)
+Describe the subsequent actions to be taken.