update README and CONTRIBUTING files; added PULL_REQUEST_TEMPLATE; database user-creation fix for MySQL8

Signed-off-by: Michael Kaufmann <d00p@froxlor.org>

.github/PULL_REQUEST_TEMPLATE.md

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+# Description
+
+Please include a summary of the change and which issue is fixed if any. Please also include relevant motivation and context. List any dependencies that are required for this change.
+
+Fixes # (issue)
+
+## Type of change
+
+Please delete options that are not relevant.
+
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] This change requires a documentation update
+
+# How Has This Been Tested?
+
+Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration
+
+- [ ] Test A
+- [ ] Test B
+
+**Test Configuration**:
+
+* Distribution:
+* Webserver:
+* PHP:
+* etc.etc.:
+
+# Checklist:
+
+- [ ] I have performed a self-review of my own code
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have made corresponding changes to the documentation
+- [ ] My changes generate no new warnings
+- [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] New and existing unit tests pass locally with my changes
+