doc: updated contributors file

Signed-off-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: bot-go-openapi[bot]

CONTRIBUTORS.md

@@ -0,0 +1,13 @@
+# Contributors
+
+- Repository: ['go-openapi/ci-workflows']
+
+| Total Contributors | Total Contributions |
+| --- | --- |
+| 1  | 2  |
+
+| Username | All Time Contribution Count | All Commits |
+| --- | --- | --- |
+| @fredbi | 2 | https://github.com/go-openapi/ci-workflows/commits?author=fredbi |
+
+ _this file was generated by the [Contributors GitHub Action](https://github.com/github/contributors)_