Managed by Terraform: Add PULL_REQUEST_TEMPLATE.md issue template

Author: nywilken

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,17 @@
+**DELETE THIS TEMPLATE BEFORE SUBMITTING**
+
+In order to have a good experience with our community, we recommend that you
+read the contributing guidelines for making a PR, and understand the lifecycle
+of a Packer Plugin PR:
+
+https://github.com/hashicorp/packer-plugin-tencentcloud/blob/main/.github/CONTRIBUTING.md#opening-an-pull-request
+
+Describe the change you are making here!
+
+Please include tests. We recommend looking at existing tests as an example. 
+
+If your PR resolves any open issue(s), please indicate them like this so they will be closed when your PR is merged:
+
+Closes #xxx
+Closes #xxx
+