A single file can be committed by using one of the GHRepository.createContent() methods.

In order to commit multiple files, the following steps have to be taken:

1. Get the SHA of the latest commit on the branch
2. Get the tree information for that commit
3. Create a new tree for your commit
4. Create the commit
5. Link commit to the reference

The operations in steps 3 and 4 are currently not suppported by github-api. They involve:

• creating a blob
• creating a tree
• creating a commit

Do you find the addition of these operations useful? If yes, I will create a PR for this.