add xbindkeys bindings

.xbindkeysrc

@@ -0,0 +1,14 @@
+"fish -c 'ss 0'"
+    m:0x0 + c:191
+    XF86Tools
+
+
+"fish -c 'math (cat /sys/class/backlight/backlight/brightness)-2000 > /sys/class/backlight/backlight/brightness'"
+    m:0x40 + c:72
+    Mod4 + F6
+
+
+"fish -c 'math (cat /sys/class/backlight/backlight/brightness)+2000 > /sys/class/backlight/backlight/brightness'"
+    m:0x40 + c:73
+    Mod4 + F7
+