Adds justfile to build everything

crates/kernel-macros/src/lib.rs

@@ -0,0 +1,8 @@
+mod image;
+
+use proc_macro::TokenStream;
+
+#[proc_macro]
+pub fn include_font_plate(input: TokenStream) -> TokenStream {
+    image::include_font_plate_impl(input)
+}