Add todo module

src/module/todo/mod.rs

@@ -0,0 +1,23 @@
+use super::Module;
+use std::path::Path;
+
+pub struct TodoModule {
+    path: Option<String>,
+}
+
+impl Module for TodoModule {
+
+    fn new(rt : &Runtime) -> TodoModule {
+        TodoModule {
+            path: None
+        }
+    }
+
+    fn name(&self) -> String {
+        "Todo".to_string()
+    }
+
+    fn execute(&self, rt : &Runtime) -> Option<Error> {
+        ( )
+    }
+}