Adds rust toolchain file for lsp purposes

[grarco]

No description provided.

[sug0]

instead of adding a new file, can you point rust-toolchain to rust-stable-version? basically, create a symbolic link, instead of a new file.

this will make maintenance easier. the goal is to change the least amount of files possible in order to upgrade to a new rust toolchain, in the future.

ideally, we shouldn't even push these kinds of files, IMO. we can add them to the local ignore list (.git/info/exclude). this is what I use for *.vim files:

# git ls-files --others --exclude-from=.git/info/exclude
# Lines that start with '#' are comments.
# For a project mostly in C, the following would be a good set of
# exclude patterns (uncomment them if you want to use them):
# *.[oa]
# *~

/*.vim

[grarco]

Got you, I'm closing this pr then