implemented basic settings page with background service running option

src/main/java/io/lbry/lbrynet/reactmodules/DaemonServiceControlModule.java

@@ -0,0 +1,31 @@
+package io.lbry.lbrynet.reactmodules;
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.pm.ActivityInfo;
+
+import com.facebook.react.bridge.ReactApplicationContext;
+import com.facebook.react.bridge.ReactContextBaseJavaModule;
+import com.facebook.react.bridge.ReactMethod;
+
+import io.lbry.lbrynet.LbrynetService;
+import io.lbry.lbrynet.ServiceHelper;
+
+public class DaemonServiceControlModule extends ReactContextBaseJavaModule {
+    private Context context;
+
+    public DaemonServiceControlModule(ReactApplicationContext reactContext) {
+        super(reactContext);
+        this.context = reactContext;
+    }
+
+    @Override
+    public String getName() {
+        return "DaemonServiceControl";
+    }
+
+    @ReactMethod
+    public void stopService() {
+        ServiceHelper.stop(context, LbrynetService.class);
+    }
+}