Net: Start work on this

src/main.rs

@@ -1,5 +1,7 @@
 mod db;
 mod log;
+mod net;
+mod message;
 
 fn main() {
     let mut db = db::get_backend("sqlite");

src/message.rs

@@ -0,0 +1 @@
+enum Message {}

src/net/mod.rs

@@ -0,0 +1,11 @@
+use crate::log::*;
+
+trait NetBackend {
+    fn start(&mut self) -> Result<(), String>;
+    fn stop(&mut self) -> Result<(), String>;
+
+    fn notify_existance(&mut self) -> Result<(), String>;
+    fn notify_shutdown(&mut self) -> Result<(), String>;
+
+    fn send(&mut self, id: &str, message: &str) -> Result<(), String>;
+}