Zig allocator demo, using extram

apps/zigalloc/src/main.zig

@@ -0,0 +1,18 @@
+const uvm = @import("uvm.zig");
+const console = @import("console.zig").getWriter();
+
+fn submain() !void {
+    try console.print("Hello world\n", .{});
+    try console.flush();
+
+    const foo = try uvm.allocator().dupe(u8, "copy me");
+    try console.print("dupe={s}\n", .{foo});
+    try console.flush();
+
+}
+
+export fn main() void {
+    _ = submain() catch {
+        uvm.println("Caught err");
+    };
+}