Update README.md

README.md

@@ -9,6 +9,16 @@
 swaybar\_info is a program to be utilized by swaybar that is used by the [Sway
 tiling Wayland compositor](https://swaywm.org).
 
+## Help Text
+
+    Usage:
+      -h | --help Prints help
+      --netdev=<device_name>                           Check network traffic on specified device
+      --interval-sec=<seconds>                         Output at intervals of <seconds> (default 5)
+      --acpi-builtin                                   Use "acpi -b" built-in fetching (battery info, with color)
+      --regex-cmd=<cmd>[SPLIT]<args...>[SPLIT]<regex>  Use an output of a command as a metric
+      --date-format=<date format string>               Set the format string for the date
+
 ## Usage
 
     # build the "release" build of the program