Improvement of git add interface

Hello,

I introduce git to students and thus see, where they have a harder time than necessary to understand git.

Thus, I was thinking about a CLI improvement regarding "git add". It follows from the observation, that the students can learn consistent interfaces faster.

Similar to "ls -a" = "ls --all" there is a "git commit -a" = "git commit -- all", which means the same thing: use all files (with the known exceptions in git). There is a "git add -A" = "git add --all", too, which is basically the same. This leads to the following consistency question: Why is there no "git add -a"? I suggest adding "git add -a" as an alias to "git add -add". Maybe "git add -A" could then be deprecated in the long run, to not waste option name space, but this can be discussed later.

Kind regards Patrick

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