Load sift data from stdin

brood/src/main.rs

@@ -1,3 +1,17 @@
-fn main() {
-    println!("Hello, world!");
+mod ingest;
+
+use std::io;
+
+use clap::Parser;
+
+#[derive(Debug, Parser)]
+enum Command {
+    /// Read sift data on stdin and output brood data on stdout.
+    Ingest,
+}
+
+fn main() -> io::Result<()> {
+    match Command::parse() {
+        Command::Ingest => ingest::ingest(),
+    }
 }