chore: add pr template

.github/pull_request_template.md

@@ -0,0 +1,11 @@
+<!--
+	Thank you for opening a PR!
+
+	Before you continue, please:
+		- set the target repo to `wkillerud/vscode-scss` and the target branch to `main`
+		- ensure your commits follow the conventional commit format described on https://github.com/wkillerud/vscode-scss/blob/main/CONTRIBUTING.md#conventional-commits
+		- confirm `npm run lint && npm run test && npm run test:e2e` run without errors on your machine
+
+	If your PR has more than one commit, please set a descriptive title and summarize the changes.
+	If it's just one commit the default title is fine.
+-->