Add warning about `rust-analyzer` not working if you clone and use the repo directly#2131

MadLittleMods wants to merge 4 commits intorust-lang:mainrust-lang/rustlings:mainfrom

MadLittleMods:madlittlemods/repo-clone-rust-analyzer-not-working-warningMadLittleMods/rustlings:madlittlemods/repo-clone-rust-analyzer-not-working-warningCopy head branch name to clipboard