setup project files

Added (most) of the project files to the working tree.
Some work still needs to be done to make the rust/C communication better
before we can fully move on to starting to write the actual applicaiton.

src/lib.rs

@@ -0,0 +1,12 @@
+#![no_std]
+
+#[panic_handler]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    loop {}
+}
+
+#[unsafe(no_mangle)]
+pub unsafe extern "C" fn get_str() -> *const u8 {
+    let str = "Hello, World\0";
+    return str.as_ptr();
+}

src/main.c

@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+extern char const* get_str(void);
+
+int main(int argc, char** argv) {
+	(void)argc, (void)argv;
+	printf("%s\n", get_str());
+}