Create PULL_REQUEST_TEMPLATE.md

Author: jim-parry

PULL_REQUEST_TEMPLATE.md

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+Each pull request should address a single issue, and have a meaningful title.
+
+**Description**
+Explain what you have changed, and why.
+
+**Checklist:**
+- [ ] Securely signed commits
+- [ ] Component(s) with PHPdocs
+- [ ] Unit testing, with >80% coverage
+- [ ] User guide updated
+- [ ] Conforms to style guide
+
+---------Remove from here down in your description----------
+
+**Notes**
+- Pull requests must be in English
+- If the PR solves an issue, reference it with a suitable verb and the issue number
+(e.g. fixes <hash>12345
+- Unsolicited PRs will be considered, but there is no guarantee of acceptance
+- Pull requests should be from a feature branch in the contributor's fork of the repository
+  to the develop branch of the project repository
+