Update ISSUE_TEMPLATE.md

Author: satra

.github/ISSUE_TEMPLATE.md

@@ -6,5 +6,17 @@
 
 ### How to replicate the behavior
 
+### Script/Workflow details
+
+Please put URL to code or code here (if not too long).
+
 ### Platform details:
-please paste the output of: `python -c "import nipype; print(nipype.get_info()); print(nipype.__version__)"`
+
+Please paste the output of: `python -c "import nipype; print(nipype.get_info()); print(nipype.__version__)"`
+
+### Execution environment
+
+Choose one
+- Container [Tag: ???]
+- My python environment inside container [Base Tag: ???]
+- My python environment outside container