docs(readme): Add README

README.md

@@ -1 +1,18 @@
-# umbra-launcher
+# umbra-launcher
+
+A patch client for Wizard101. It connects to the Wizard101 patch and login servers, verifies and downloads necessary files, and launches the game client.
+
+## Options
+
+- `-dir string`
+  - Client directory (default "Wizard101")
+- `-username string`
+  - Login username
+- `-password string`
+  - Login password
+- `-login-server string`
+  - Login server address (default "login.us.wizard101.com:12000")
+- `-patch-server string`
+  - Patch server address (default "patch.us.wizard101.com:12500")
+- `-patch-only`
+  - Only patch files without logging in