Adding draft SLA to issue-management.md file

CONTRIBUTING.md

@@ -18,4 +18,41 @@ OK on GitHub.
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+the box settings for this repository will be consistent.
+
+## SLA
+
+For Issues
+
+* For original poster (OP), after opening an urgent issue, please allow at least 
+(proposed) 1 business day before following up with the triager or assignee to 
+give time to work the issue and respond. Feel free to provide additional info/data 
+or ask further questions at anytime. Use URGENT label to distinguish from other 
+issues and provide reason behind the urgency.
+
+* For OP, after opening a non-urgent issue, please allow at least (proposed) 3 
+business days before follow up with the triager or assignee to give time to work 
+the issue and respond. Feel free to provide additional info/data or ask further 
+questions at anytime.
+
+* For assignee, if the associated PR is merged, please proceed to close the issue, 
+if not done already. For issues without PR and after providing 
+answers/resolution/workarounds, please allow at least (proposed) 2 business days 
+for OP to respond/acknowledge before closing an issue.
+
+For PRs
+
+* Please allow a minimum of (proposed) 3 business days review period for PRs before 
+they could be merged.
+
+* Maximum response time from reviewers/contributors: proposing 3 business days.
+
+* If there is an exception to the general SLA, please highlight reasons in comments. 
+Valid exceptions are urgent fixes, typo, bug fixes, doc improvements, backfilling tests, 
+adding CI PRs or implementing what have already been discussed/agreed, etc..
+
+* If SLA is violated and with no reason/justification comments, please be prepared to 
+accept another PR which could modify or rollback prior changes.
+
+* Proposing to have 2 approvals from different companies for interface/design impacting changes.
+