Update issue and PR template (SonarSource#162)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Versions used:**
+- Chart Version:
+- SonarQube Version:
+- Helm Version:
+- Kubernetes Version:
+
+**Custom Values**
+Please add a minimal value example to reproduce this error
+```yaml
+
+```
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Additional context**
+Add any other context about the problem here.

.github/PULL_REQUEST_TEMPLATE.md

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+Please ensure your pull request adheres to the following guidelines:
+- [ ] explain your motives to contribute this change: what problem you are trying to fix, what improvement you are trying to make
+- [ ] Document your Changes in the `CHANGELOG.md` file of the respected chart as well as the `Chart.yaml`
+- [ ] Bump the Version number of the respected chart