Add aliases for git switch and switch -c

[maks-rafalko]

• git switch should be used instead of git checkout
• git switch -c should be used instead of git checkout -b

I didn't find aliases for git switch, so here is a proposal.

git s is already assigned to git status, so probably:

• git sw = switch
• git swc = switch -c

?

[joelparkerhenderson]

Good idea, thank you. As soon as git switch is out of experimental i.e. stabilized, then we'll do this.

See the git documentation where git switch says "THIS COMMAND IS EXPERIMENTAL. THE BEHAVIOR MAY CHANGE."