Add build instructions for the todored binary

todored/BUILD.md

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+# Build instructions
+
+## Building the binary
+
+### Prerequisites
+
+To build the `todored` crate, the following must be installed on your local machine:
+
+- [Rust](https://www.rust-lang.org/)
+  - rustc (stable)
+  - cargo
+
+### Build
+
+To begin compilation, run the following cargo command:
+
+```console
+$ cargo build --release
+```
+
+### Artifacts
+
+The built executable will be available in `target/release/todored`.