retroarch.cfg: Add `fps_show` and `framecount_show`

retroarch.cfg

@@ -121,6 +121,12 @@
 # by video driver.
 # suspend_screensaver_enable  = true
 
+# Display framerate.
+# fps_show = false
+
+# Display total number of frames rendered. (only displays if fps_show is enabled)
+# framecount_show =
+
 # Which monitor to prefer. 0 (default) means no particular monitor is preferred, 1 and up (1 being first monitor),
 # suggests RetroArch to use that particular monitor.
 # video_monitor_index = 0