add systemd configuration option

open PR: https://github.com/eventure/hide.client.linux/pull/10

systemd-config.patch

@@ -0,0 +1,30 @@
+diff --git a/config b/config
+new file mode 100644
+index 0000000..f0d2bfb
+--- /dev/null
++++ b/config
+@@ -0,0 +1 @@
++OPTIONS=
+diff --git a/hide.me@.service b/hide.me@.service
+index b32902f..46b44ef 100644
+--- a/hide.me@.service
++++ b/hide.me@.service
+@@ -6,9 +6,10 @@ DefaultDependencies=yes
+ 
+ [Service]
+ Type=notify
+-ExecStart=/opt/hide.me/hide.me connect %i
++ExecStart=/opt/hide.me/hide.me connect $OPTIONS %i
+ WorkingDirectory=/opt/hide.me
+ ReadWritePaths=/opt/hide.me /etc
++EnvironmentFile=/opt/hide.me/config
+ TimeoutStopSec=30
+ Restart=always
+ RestartSec=5s
+@@ -30,4 +31,4 @@ Group=root
+ LimitNOFILE=64
+ 
+ [Install]
+-WantedBy=multi-user.target
+\ No newline at end of file
++WantedBy=multi-user.target