Added Play store description

PLAY.md

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+Play store
+==========
+
+Title
+-----
+NetGuard
+
+
+Short description
+-----------------
+No-root firewall
+
+
+Long description
+----------------
+NetGuard is a simple way to block access to the internet - no root required.
+
+Applications can individually be allowed or denied access to your WiFi and/or mobile connection.
+
+Blocking access to the internet can help:
+
+- reduce your data usage
+- save your battery
+- increase your privacy
+
+Features:
+
+- No root required
+- Simple to use
+- Free of charge
+- Open source
+- No extra battery usage
+- No calling home
+- No tracking or analytics
+- No ads
+- IPv4/IPv6 TCP/UDP supported
+- Block system and user applications
+
+NetGuard does not even require the internet permission.
+
+NetGuard is possibly the first free and open source no-root firewall for Android.
+
+More information:
+http://forum.xda-developers.com/showthread.php?t=3233012