After the initial GIT set up you can do much of the console commands in Aptana. With an existing folder, you can add it as a project within the Aptana project explorer:
Open Project Explorer side pane
Right click on it and choose “Import”
Choose “Existing Folder as New Project” and click next.
Fill in the Promote to Project Page:
Browse to select the root folder of project
Give it a project name (same as repo?)
Choose project type
Click “Finish”.
Then open the terminal window and initialize the repo as in the “Adding Repo” section.
To connect an Aptana project to a Git repo, right click on the project root folder/name and choose Team Share Project.
After that the “Team” context menu will have the regular Git commands: Push, Pull, Stage, Commit, Status, etc.