Add templates for issues and pull requests

Author: ibmmqmet

.github/ISSUE_TEMPLATE.md

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+Please include the following information in your ticket.
+
+- mq-smf-csvs version(s) that are affected by this issue.
+- A data sample that demonstrates the issue
+- Command used to format the data
+- Actual and expected output (data files and screen)

.github/PULL_REQUEST_TEMPLATE.md

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+Please ensure all items are complete before opening.
+
+- [ ] Tick to sign-off your agreement to the [IBM Contributor License Agreement](https://github.com/ibm-messaging/mq-smf-csv/CLA.md)
+- [ ] You have added tests for any code changes
+- [ ] You have updated the [CHANGES.md](https://github.com/ibm-messaging/mq-smf-csv/CHANGES.md)
+- [ ] You have completed the PR template below:
+
+## What
+
+What was changed
+
+## How
+
+How the change was implemented or reasoning behind it
+
+## Testing
+
+How to test your changes work, not required for documentation changes.
+
+## Issues
+
+Links to the github issue(s) (if present) that this pull request is resolving.