Create README.md

.github/workflows/README.md

+# Workflows
+
+## Delete runs by workflow name
+
+```bash
+gh run list --workflow 'redis-server-tests.yml' --limit 1000 --json databaseId \
+  | jq '.[].databaseId' \
+  | xargs -I % gh api --silent -X DELETE /repos/predis/predis/actions/runs/%
+```