Finish FVM package

src/main.rs

@@ -1,6 +1,26 @@
+#[cfg(target_os = "windows")]
 mod windows;
+
+#[cfg(target_os = "linux")]
+mod linux;
+
+#[cfg(target_os = "macos")]
+mod macos;
+
 pub mod common;
 
 fn main() {
+    #[cfg(target_os = "windows")]
     windows::start();
+
+    #[cfg(target_os = "linux")]
+    linux::start();
+
+    #[cfg(target_os = "macos")]
+    macos::start();
+
+    #[cfg(not(target_os = "windows"))]
+    #[cfg(not(target_os = "linux"))]
+    #[cfg(not(target_os = "macos"))]
+    println!("[ERROR] Operating system not supported");
 }