Add NetworkHelper

app/src/main/java/chat/rocket/android/helper/NetworkHelper.kt

+package chat.rocket.android.helper
+
+import kotlinx.coroutines.experimental.CommonPool
+import kotlinx.coroutines.experimental.run
+import java.io.IOException
+import java.net.InetSocketAddress
+import java.net.Socket
+
+object NetworkHelper {
+
+    /**
+     * Checks whether there is internet access.
+     *
+     * The original author of this code is Levit and you can see his answer here: https://stackoverflow.com/a/27312494/4744263
+     *
+     * @return true if there is internet access, false otherwise.
+     */
+    suspend fun hasInternetAccess(): Boolean = run(CommonPool) {
+        try {
+            val socket = Socket()
+            val inetSocketAddress = InetSocketAddress("8.8.8.8", 53)
+
+            socket.connect(inetSocketAddress, 1500)
+            socket.close()
+
+            true
+        } catch (e: IOException) {
+            false
+        }
+    }
+}
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