add description of changes

CHANGES

@@ -0,0 +1,21 @@
+This version of dwm differs from the original on suckless.org as follows:
+
+- added config.h to clean
+  (so be careful!)
+- applied systray patch
+- applied modified autostart patch
+  (scripts in ~/suckless/dwm/, added cleanup_autostart.sh)
+- applied modified zoomswap patch
+  (added config option zoomswap = 1 for active, = 0 for old behaviour)
+- applied swallow patch
+- applied modified centered master patch
+  (bound to Mod+c, no centered floating, changed stacking behaviour to always push onto left side)
+
+- deleted Firefox from rules
+- changed Mod key from Alt to Windows key
+- increased borderpx from 1 to 2
+- set to ignore resize hints
+- added ControlMask to spawning via dmenu, so both terminal and dmenu spawn use same masking
+- added key Mod+Ctrl+l to lock screen with slock
+- added gutmet's dmenu_charinput to Mod+e to enter special unicode chars
+- replaced all key bindings containing Shiftmask with Controlmask

README

@@ -7,6 +7,12 @@ Requirements
 ------------
 In order to build dwm you need the Xlib header files.
 
+This version contains the 'swallow' patch, which depends on
+
+- libx11-xcb
+- libxcb
+- libxcb-res
+
 
 Installation
 ------------