[nvim] Add an app template snippet for Nannou apps (nnapp)

config/nvim/UltiSnips/rust.snippets

@@ -0,0 +1,38 @@
+# rust.snippets
+# vim: set ts=8 sw=8 sts=8 noet list:
+# Eryn Wells <eryn@erynwells.me>
+
+snippet nnapp
+// Eryn Wells <eryn@erynwells.me>
+
+use nannou::prelude::*;
+
+struct Model {
+	_window: window::Id,
+}
+
+impl Model {
+	fn new(app: &App) -> Self {
+		let window = app.new_window().view(view).build().unwrap();
+		Self {
+			_window: window,
+		}
+	}
+
+	fn update(app: &App, model: &mut Model, update: Update) {
+		model.update(app, update)
+	}
+
+	fn update(&mut self, app: &App, update: Update) {
+		// TODO: Update the model here.
+	}
+}
+
+fn view(app: &App, model: &Model, frame: Frame) {
+	// TODO: Draw the view here.
+}
+
+fn main() {
+	nannou::app(Model::new).update(update).run();	
+}
+endsnippet