Enable and create github issue templates

As per:
https://help.github.com/en/articles/creating-issue-templates-for-your-repository

> **Creating issue templates for your repository**
> When you create issue templates for your repository using the issue template builder, they'll be available for contributors to use when they open new issues in the repository.

Suggested templates:
User Story Template Example

```
## User Story:
(Please describe the task or feature you are requesting)

As a
I want
So that

## Implementation Details:
(Please include any additional details required to describe this issue)
* .
* .

## Related Issues
(Please include links to other related issues by using the #number auto link syntax)
* .

## Service Desk Issues
( Please include any links to existing service desk issues related to this issue)
* [Issue Name](http://link.to.issue)

## Business Value:
(Please select a single business value based on the MoSCoW model. Deafult: Must Have)
* [x] Must Have
* [ ] Should Have
* [ ] Could Have
* [ ] Would Like to Have

## User Story Points (Effort)
( Please estimate the number of User Story points you this this issue deserves. Default: 10)
* [ ] Unknown
* [ ] 0
* [ ] 1
* [ ] 2
* [ ] 3
* [ ] 5
* [ ] 8
* [x] 10
* [ ] 15
* [ ] 25
* [ ] 50
* [ ] 100
* [ ] Infinity
```

Start with GitHub's linked guide on creating issue templates and compare the suggested User Story Template Example with the repository's issue-template options. Create the requested template with its user story, implementation details, related issues, service desk issues, business value, and effort sections, then verify it appears when opening a new issue.

Written by the indexing model from the issue text.