Add bazel rules

crates/committer/BUILD

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+# To be used together with a bazel WORKSPACE file that contains the following definitions.
+load("@committer_crate//:defs.bzl", "all_crate_deps")
+load("@rules_rust//rust:defs.bzl", "rust_binary")
+
+rust_binary(
+    name = "committer_exe",
+    srcs = glob(["src/**/*.rs"]),
+    edition = "2021",
+    proc_macro_deps = all_crate_deps(proc_macro = True),
+    visibility = ["//visibility:public"],
+    deps = all_crate_deps(),
+)

crates/committer/src/main.rs

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+use std::env;
+use std::path::Path;
+
+/// Gets a binary input and an output file from the command line.
+/// Reads the input file, adds 1 to each byte, and writes the result to the output file.
+fn main() {
+    // Open the input file
+    let args: Vec<String> = env::args().collect();
+    let input_file_name = Path::new(&args[1]);
+    let output_file_name = Path::new(&args[2]);
+    assert!(
+        input_file_name.is_absolute() && output_file_name.is_absolute(),
+        "Given paths must be absolute"
+    );
+    let mut bytes = std::fs::read(input_file_name).unwrap();
+
+    // Add 1 to each byte
+    for byte in &mut bytes {
+        *byte = byte.wrapping_add(1);
+    }
+    std::fs::write(output_file_name, bytes).expect("Failed to write output");
+}