add ProxyDroid by @madeye

Author: pcqpcq

categories/communication.md

@@ -1,3 +1,4 @@
 ## Communication  
 App Name                   | Describe                  | Major Language             | Download 
 :------------------------: | :------------------------ | :------------------------: | :------------------------: 
+[ProxyDroid](https://github.com/madeye/proxydroid) | Global Proxy for Android  | C | [![Get it on Google Play](https://developer.android.com/images/brand/en_app_rgb_wo_45.png)](https://play.google.com/store/apps/details?id=org.proxydroid)