dmesg: initialize empty dmesg crate.

src/uu/dmesg/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "uu_dmesg"
+version = "0.0.1"
+edition = "2021"
+
+[lib]
+path = "src/dmesg.rs"
+
+[[bin]]
+name = "dmesg"
+path = "src/main.rs"
+
+[dependencies]
+clap = { workspace = true }
+uucore = { workspace = true }

src/uu/dmesg/src/dmesg.rs

@@ -0,0 +1,11 @@
+use clap::{crate_version, Command};
+use uucore::error::UResult;
+
+#[uucore::main]
+pub fn uumain(_args: impl uucore::Args) -> UResult<()> {
+    Ok(())
+}
+
+pub fn uu_app() -> Command {
+    Command::new(uucore::util_name()).version(crate_version!())
+}

src/uu/dmesg/src/main.rs

@@ -0,0 +1 @@
+uucore::bin!(uu_dmesg);