Add a parameter to add a new folder automatically

### Feature summary

I want to be able to launch "github" with a parameter like "." "./github ." or "github /my/repo" and the repo would be added automatically in the session list

### What problem are you trying to solve?

I work with a huge number of repos, icking them one by one in the folder list is a waste of time. I'd like to be able to launch "github" command with a repository parameter (absolure or relative) so that the path would be added in the session list.

### Proposed solution

Add a parameter to the session.

### Workflow impact

add project easilly in the app

### Installation context

_No response_

### Additional context

_No response_

Start by locating the github launch command and the code that builds the session list; the issue names no source files or tests. Trace how command-line arguments are handled and define the behavior for relative and absolute repository paths, then add coverage showing that the supplied path appears in the session list.

Scritto dal modello di indicizzazione a partire dal testo della issue.