added hello world

Author: Pyrolistical

hello-world.py

@@ -0,0 +1,15 @@
+from cffi import FFI
+
+cffi = FFI()
+cffi.cdef(
+    """
+      void print(char* x);
+    """
+)
+
+import os
+
+helloWorld = cffi.dlopen(os.path.abspath("hello-world.dll"))
+
+# pass in null-terminated array
+helloWorld.print(b"Hello world\x00")

hello-world.zig

@@ -0,0 +1,9 @@
+const std = @import("std");
+
+// messageZ must be null-terminated
+export fn print(messageZ: [*]u8) void {
+    // [*:0]u8 is not allowed by C ABI, cast to right type
+    const message = @ptrCast([*:0]u8, messageZ);
+
+    std.debug.print("{s}", .{message});
+}