Add usage to README

Signed-off-by: Skylar "The Cobra" Widulski <cobra@vern.cc>

README.md

@@ -1,26 +1,56 @@
 # wf-shadow
+
 `wf-shadow` is a script written in order to fill the void in instant-replay software for Wayland, specifically wlroots compositors. It uses wf-recorder and wofi in order to accomplish the task.
 
+
+# Usage
+
+```
+OPTIONS:
+	-s, --start [MONITOR]	Start a wf-shadow instance with display number MONITOR.
+	-r, --record [MONITOR]	Record the last few moments of video using a wofi menu.
+	-e, --end [MONITOR]	End wf-shadow instance with display number MONITOR.
+	-a, --audio DEVICE	Use DEVICE for audio recording. Passed to wf-recorder -a.
+	-V, --video DEVICE	Use DEVICE for video encoding. Passed to wf-recorder -d.
+	-n, --no-audio	Disable audio recording. Overrides -a.
+	-v, --verbose	Verbose output.
+	-h, --help	Show this menu.
+
+For a more in-depth guide, see wf-shadow(1)
+```
+
+
 # Dependencies
+
 This script depends on `wf-recorder`, `wofi`, and, obviously, `bash`.
 
+
 # Installation
 
 ## Package Manager
+
 Currently, no distributions include `wf-shadow` as a package. See "Manual Installation".
 
+
 ## Manual Installation
+
 Put this script somewhere in your $PATH. To find which directories are in your $PATH, run `sed 's/:/\n/g' <<< "$PATH"`.
 
+
 # Contributing
 
 ## Writing issues
+
 Make sure to state as many details relating to wf-shadow as possible when making an issue. These include, but are not limited to: version, dependency versions, and verbose (-v) output.
 
+
 ### Common issues
 
 #### "A wf-shadow instance is already running on display X" but no wf-shadow is running.
+
 If you're certain wf-shadow is not running on that display, remove the file in the parentheses with `rm`.
 
+
 ## Merge requests
+
 Make sure to always keep the style of code used in wf-shadow when requesting a merge (we don't want inconsistencies or unreadable code!)