clearml-helm-charts/.github/PULL_REQUEST_TEMPLATE.md

**What this PR does / why we need it**:


**Checklist**
- [ ] Reviewed the [`CONTRIBUTING.md`](https://github.com/clearml/clearml-helm-charts/blob/main/CONTRIBUTING.md#pull-requests) guide (**required**)
- [ ] Verify the work you plan to merge addresses an existing [issue](https://github.com/clearml/clearml-helm-charts/issues) (If not, open a new one) (**required**)
- [ ] Check your branch with `helm lint` (**required**)
- [ ] Update `version` in `Chart.yaml` according [semver](https://semver.org/) rules (**required**)
- [ ] Substitute `annotations` section in `Chart.yaml` annotating implementations (useful for Artifecthub changelog) (**required**)
- [ ] Update chart README using [helm-docs](https://github.com/norwoodj/helm-docs) (**required**)


**Which issue(s) this PR fixes**:

Fixes #<issue number>

**Special notes for your reviewer**: