add some usage notes

BrianMacIntosh · web-flow · commit 7b9dcc440091 · 2021-03-10T14:25:05.000-08:00
diff --git a/README.md b/README.md
@@ -2,3 +2,7 @@
 GUI program for launching and managing a Valheim server.
 
 ![ValheimServerWizard basic screenshot](/Screenshots/Screenshot000.png)
+
+# Usage
+* The "Valheim Dedicated Server" must be installed on your computer using Steam.
+* If you are behind a router, the ports used must be correctly forwarded.
