Merge branch 'patch-1' into 'master'

Add README

See merge request hfyngvason/auto-devops-v12-10!1

README.md

+# GitLab 12.10 Auto DevOps and Secure CI templates
+
+This is an extraction of CI templates as of GitLab 12.10.
+
+This allows you to use these templates if updating your `.gitlab-ci.yml` to use `rules`
+is not possible.
+(In GitLab 13.0, [Auto DevOps and Secure CI templates transistions to use `rules`](https://gitlab.com/groups/gitlab-org/-/epics/2300))
+
+## How to use
+
+TBD. Consider
+
+- project on GitLab.com
+- project on another self-managed instance
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