Add PR template (#625)

* Add PR template

Signed-off-by: Anatolii Bazko <abazko@redhat.com>

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,43 @@
+<!-- Please review the following before submitting a PR:
+che-operator Development Guide: https://github.com/eclipse/che-operator/#development
+-->
+
+### What does this PR do?
+
+
+### Screenshot/screencast of this PR
+<!-- Please include a screenshot or a screencast explaining what is doing this PR -->
+
+
+### What issues does this PR fix or reference?
+<!-- Please include any related issue from eclipse che repository (or from another issue tracker).
+     Include link to other pull requests like documentation PR from [the docs repo](https://github.com/eclipse/che-docs)
+-->
+
+
+### How to test this PR?
+<!-- Please explain for example :
+  - The test platform (openshift, kubernetes, minikube, CodeReady Container, docker-desktop, etc)
+  - steps to reproduce
+ -->
+
+
+### PR Checklist
+
+[As the author of this Pull Request I made sure that:](https://github.com/eclipse/che/blob/master/CONTRIBUTING.md#pull-request-template-and-its-checklist)
+
+- [ ] [The Eclipse Contributor Agreement is valid](https://github.com/eclipse/che/blob/master/CONTRIBUTING.md#the-eclipse-contributor-agreement-is-valid)
+- [ ] [Code produced is complete](https://github.com/eclipse/che/blob/master/CONTRIBUTING.md#code-produced-is-complete)
+- [ ] [Code builds without errors](https://github.com/eclipse/che/blob/master/CONTRIBUTING.md#code-builds-without-errors)
+- [ ] [Tests are covering the bugfix](https://github.com/eclipse/che/blob/master/CONTRIBUTING.md#tests-are-covering-the-bugfix)
+- [ ] [Custom resource definition file is up to date](https://github.com/eclipse/che-operator/blob/master/README.md#updating-custom-resource-definition-file)
+- [ ] [Nightly OLM bundle is up to date](https://github.com/eclipse/che-operator/blob/master/README.md#update-nightly-olm-bundle)
+- [ ] [The repository devfile is up to date and works](https://github.com/eclipse/che/blob/master/CONTRIBUTING.md#the-repository-devfile-is-up-to-date-and-works)
+- [ ] [Sections `What issues does this PR fix or reference` and `How to test this PR` completed](https://github.com/eclipse/che/blob/master/CONTRIBUTING.md#sections-what-issues-does-this-pr-fix-or-reference-and-how-to-test-this-pr-completed)
+- [ ] [Relevant user documentation updated](https://github.com/eclipse/che/blob/master/CONTRIBUTING.md#relevant-contributing-documentation-updated)
+- [ ] [Relevant contributing documentation updated](https://github.com/eclipse/che/blob/master/CONTRIBUTING.md#relevant-contributing-documentation-updated)
+- [ ] [CI/CD changes implemented, documented and communicated](https://github.com/eclipse/che/blob/master/CONTRIBUTING.md#cicd-changes-implemented-documented-and-communicated)
+
+### Reviewers
+
+Reviewers, please comment how you tested the PR when approving it.