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Add a CONTRIBUTING.md with PR expectations #5

Job	Run time
Prepare	0s
Update commit on PR from automatic discovery	0s
add_update_commit_completion_comment	0s
add_update_versions_completion_comment	0s
Trigger Smoke Tests	0s
add_no_workspace_comment	0s
Override Backstage compatibility	0s
Override Backstage metadata refresh	0s
add_override_backstage_completion_comment	0s
add_error_comment	-8s
Publish PR	-9s
Update versions on PR from release branch	-9s
Parse PR Comment	-9s
	-35s