feat: add js-wasm

__wasm/js-wasm/helloworld/src/lib.rs

@@ -0,0 +1,16 @@
+use js::*;
+
+#[no_mangle]
+pub fn main() {
+    // let's dynamically create a javascript function we can invoke to write logs
+    let fn_log = js!(r##"function(strPtr, strLen) {
+        console.log(this.readUtf8FromMemory(strPtr, strLen));
+    }"##);
+    // let fn_alert = js!(r##"function(strPtr, strLen) {
+    //     alert(this.readUtf8FromMemory(strPtr, strLen));
+    // }"##);
+    let msg = "Hello World!";
+    fn_log.invoke_2(msg.as_ptr() as u32, msg.len() as u32);
+    // fn_alert.invoke_2(msg.as_ptr() as u32, msg.len() as u32);
+}
+