Add the location of the config and log files to the FAQ

docs/FAQ.md

@@ -8,6 +8,7 @@
 * [If I load a big pcap, termshark doesn't load all the packets at once - why?](#if-i-load-a-big-pcap-termshark-doesnt-load-all-the-packets-at-once---why)
 * [Termshark is too bright!](#termshark-is-too-bright)
 * [Termshark's colors are limited...](#termsharks-colors-are-limited)
+* [Where are the config and log files?](#config-and-log-files)
 * [The console is too narrow on Windows](#the-console-is-too-narrow-on-windows)
 * [How does termshark use tshark?](#how-does-termshark-use-tshark)
 * [How can I make termshark run without root?](#how-can-i-make-termshark-run-without-root)
@@ -112,6 +113,20 @@ If you run termshark under tmux or screen and always have `TERM` set in a way th
   term = "screen-256color"
 ```
 
+## Where are the config and log files?
+
+You can find the config file, `termshark.toml`, in:
+
+- `${XDG_CONFIG_HOME}/termshark/` `(${HOME}/.config/termshark/)` on Linux
+- `${HOME}/Library/Application Support/termshark/` on macOS
+- `%APPDATA%\termshark\` `(C:\Users\<User>\AppData\Roaming\termshark\)` on Windows
+
+You can find the log file, `termshark.log`, in:
+
+- `${XDG_CACHE_HOME}/termshark/` `(${HOME}/.cache//termshark/)` on Linux
+- `${HOME}/Library/Caches/termshark/` on macOS
+- `%LOCALAPPDATA%\termshark\` `(C:\Users\<User>\AppData\Local\termshark\)` on Windows
+
 ## The console is too narrow on Windows
 
 Unfortunately, the standard console window won't let you increase its size beyond its initial bounds using the mouse. To work around this, after termshark starts, right-click on the window title and select "Properties". Click "Layout" and then adjust the "Window Size" settings. When you quit termshark, your console window will be restored to its original size.