GitLab

* Add hgat example

* Add experiment

* Clean code

* clear the code

* Add index in README

* Add index in README

* Add index in README

* Add index in README

* Add index in README

* Add index in README

* Change the code title and folder name

* Ready to merge

* Prepare for rebase and change message passing function

* use git ignore to handle empty file

* change file permission to resolve empty file

* Change permission

* change file mode
Co-authored-by: Chen <chesirui@3c22fbe5458c.ant.amazon.com>
Co-authored-by: Tianjun Xiao <xiaotj1990327@gmail.com>