Add some things to README, add file location of host pidfile.

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

README.md

@@ -5,8 +5,22 @@
 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!) 

wf-shadow

@@ -191,7 +191,7 @@ if [ "$START" == 1 ]; then
 			printf "%s" "$$" > "$RUNTIME"/"$MONITOR"_host.pid
 			start
 		else
-			printf "A wf-shadow instance is already running on display %d\n" "$MONITOR"
+			printf "A wf-shadow instance is already running on display %d (%s/%d_host.pid)\n" "$MONITOR" "$RUNTIME" "$MONITOR"
 		fi
 	else
 		print_help 1