add some initial API code

src/backend/nano.js

@@ -0,0 +1,19 @@
+
+const nano = {
+    get(pid, tid, vid) {
+        return new Promise((resolve, reject) => {
+            resolve({ pid: pid, tid: tid, vid: vid, value: 0.0 });
+        });
+    },
+
+    set(pid, tid, vid, value) {
+        return new Promise((resolve, reject) => {
+            resolve({ pid: pid, tid: tid, vid: vid, value: value });
+        });
+    },
+
+    onValueReceived(listener) {
+    }
+};
+
+export default nano;

src/backend/nanodevices.js

@@ -0,0 +1,23 @@
+
+
+const nanodevices = {
+    list() {
+        return [];
+    },
+
+    async connect(devicename) {
+        return true;
+    },
+
+    async disconnect() {
+        return true;
+    },
+
+    onAttach(listener) {
+    },
+    
+    onDetach(listener) {
+    }
+};
+
+export default nanodevices;