Add liquid.js documentation.

examples/nodejs/mempool-js/liquid/addresses.ts

@@ -6,7 +6,7 @@ const init = async () => {
       liquid: { addresses },
     } = mempoolJS();
     
-    const address = '1wizSAYSbuyXbt9d8JV8ytm5acqq2TorC';
+    const address = 'Go65t19hP2FuhBMYtgbdMDgdmEzNwh1i48';
     
     const myAddress = await addresses.getAddress({ address });
     console.log(myAddress);