implement basic embassy framework

src/navigation/inputs.rs

@@ -0,0 +1,19 @@
+use esp_hal::gpio::{Input, InputConfig, Pull};
+use esp_hal::peripherals::Peripherals;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum NavCommand {
+    NextCard,
+    PrevCard,
+    Select,
+    ScanTag,
+}
+
+pub struct Inputs {
+    pub up: Input<'static>,
+    pub down: Input<'static>,
+    pub left: Input<'static>,
+    pub right: Input<'static>,
+    pub back: Input<'static>,
+    pub ok: Input<'static>,
+}