add: Configu participant

participants/2023/configu.yml

@@ -0,0 +1,7 @@
+Name: Configu
+Website: https://configu.com/
+Swag:
+  - socks
+  - shirt
+Description: "Contributors making one valid pull request will receive Configu Socks. Contributors making two or more valid pull requests will secure a Configu LIMITED-EDITION Hacktoberfest T-shirt."
+Details: https://github.com/configu/configu/issues/266