add make gengithub to contributing guide

Signed-off-by: Moritz Wiesinger <[email protected]>

Author: mowies

CONTRIBUTING.md

@@ -215,6 +215,7 @@ When submitting a component to the community, consider breaking it down into sep
     * `make generate`
     * `make multimod-verify`
     * `make generate-gh-issue-templates`
+    * `make gengithub`
     * `make addlicense`
 * **Second PR** should include the concrete implementation of the component. If the
   size of this PR is larger than the recommended size consider splitting it in