move templates

templates/rust.nix

@@ -0,0 +1,13 @@
+_: {
+  flake.templates.rust = {
+    path = ./_rust;
+    description = "A simple rust binary template";
+    welcomeText = ''
+      # Rust template
+      This is a simple rust binary template.
+      To build the project run `cargo build`.
+      To run the project run `cargo run`.
+      Before running nix build, make sure to run `cargo generate-lockfile` first.
+    '';
+  };
+}