Add transactions in batch through text

[Grommers00]

Closes #12

I created a new command for parsing a file. It then goes through the loop of a file and will sequentially add them to your spreadsheets. It takes into consideration for comments in the code as well, so you as long as you # the beginning of the line in the text file it would be able to do this.

To use this the command:
budget insert \PATH\TO\FILE

[utkuufuk]

@Grommers00 Good work so far 👍

Here's what I did:

• Added error handling so that any incorrect commands in the file won't prevent the following commands from being executed.
• Removed capability to add comments in transaction file, simply because there's no need.
• Polished styling & renamed some variables.

There's a problem though; I can only give absolute paths as the argument. I want to be able to pass relative paths too. We can merge this after that is taken care of.

[Grommers00]

Ah - Yeah, I ran into that issue at the beginning, and I found it would work in the .budget-cli folder, as a relative. I'm open to suggestions - but that was the CWD when I checked.

[utkuufuk]

@Grommers00 Before reading the file, you have to temporarily change the CWD as the directory where the user is currently running the budget insert command.

I don't know how to do it, but it shouldn't be difficult.

[utkuufuk]

@Grommers00 Nevermind, I just fixed it. It turns out I forgot to restore the CWD after building the sheet service.