[cargo] Add .cargo config.toml for lld linker

.cargo/Config.toml

@@ -0,0 +1,19 @@
+[target.x86_64-unknown-linux-gnu]
+linker = "clang"
+rustflags = ["-Clink-arg=-fuse-ld=lld"]
+
+# NOTE: you must install [Mach-O LLD Port](https://lld.llvm.org/MachO/index.html) on mac. you can easily do this by installing llvm which includes lld with the "brew" package manager:
+# `brew install llvm`
+[target.x86_64-apple-darwin]
+rustflags = ["-C", "link-arg=-fuse-ld=/usr/local/opt/llvm/bin/ld64.lld"]
+
+[target.aarch64-apple-darwin]
+rustflags = ["-C", "link-arg=-fuse-ld=/opt/homebrew/opt/llvm/bin/ld64.lld"]
+
+[target.x86_64-pc-windows-msvc]
+linker = "rust-lld.exe"
+
+# Optional: Uncommenting the following improves compile times, but reduces the amount of debug info to 'line number tables only'
+# In most cases the gains are negligible, but if you are on macos and have slow compile times you should see significant gains.
+#[profile.dev]
+#debug = 1