Updating the Repo

dlang/hello-world/hello_world.d

@@ -0,0 +1,12 @@
+module helloworld_test;
+
+import std.stdio;
+
+void main() {
+    assert(hello() == "Hello, World!");
+    assert(hello("Alice") == "Hello, Alice!");
+    assert(hello("Bob") == "Hello, Bob!");
+    assert(hello("") == "Hello, !");
+
+    writeln("All tests passed.");
+}