add example assets

examples/assets/example.cpp

@@ -0,0 +1,4 @@
+int main() {
+    std::cout << "That will only work with the right plugin in your $PATH!" << std::endl;
+    std::cout << "Checkout the `external_data_loader` C++ example." << std::endl;
+}

examples/assets/example.py

@@ -0,0 +1,4 @@
+from __future__ import annotations
+
+print("That will only work with the right plugin in your $PATH!")
+print("Checkout the `external_data_loader` Python example.")

examples/assets/example.rs

@@ -1,3 +1,4 @@
 fn main() {
     println!("That will only work with the right plugin in your $PATH!");
+    println!("Checkout the `external_data_loader` Rust example.");
 }