Add Subghz JS module

applications/system/js_app/examples/apps/Scripts/subghz.js

@@ -0,0 +1,37 @@
+let subghz = require("subghz");
+subghz.setup();
+
+function printRXline() {
+    if (subghz.getState() !== "RX") {
+        subghz.setRx(); // to RX
+    }
+
+    let rssi = subghz.getRssi();
+    let freq = subghz.getFrequency();
+    let ext = subghz.isExternal();
+
+    print("rssi: ", rssi, "dBm", "@", freq, "MHz", "ext: ", ext);
+}
+
+function changeFrequency(freq) {
+    if (subghz.getState() !== "IDLE") {
+        subghz.setIdle(); // need to be idle to change frequency
+    }
+    subghz.setFrequency(freq);
+}
+
+subghz.setIdle();
+print(subghz.getState()); // "IDLE"
+subghz.setRx();
+print(subghz.getState()); // "RX"
+
+changeFrequency(433920000);
+printRXline();
+delay(1000);
+
+let result = subghz.transmitFile("/ext/subghz/0.sub");
+print(result ? "Send success" : "Send failed");
+delay(1000);
+
+changeFrequency(315000000);
+printRXline();