initial commit

exercises/07_threads/05_channels/src/lib.rs

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+use std::sync::mpsc::{Receiver, Sender};
+
+pub mod data;
+pub mod store;
+
+pub enum Command {
+    Insert(todo!()),
+}
+
+// Start the system by spawning the server thread.
+// It returns a `Sender` instance which can then be used
+// by one or more clients to interact with the server.
+pub fn launch() -> Sender<Command> {
+    let (sender, receiver) = std::sync::mpsc::channel();
+    std::thread::spawn(move || server(receiver));
+    sender
+}
+
+// TODO: The server task should **never** stop.
+//  Enter a loop: wait for a command to show up in
+//  the channel, then execute it, then start waiting
+//  for the next command.
+pub fn server(receiver: Receiver<Command>) {}