mediakeys patch

- Apply mediakeys patch
- Update README with link to mediakeys patch
- Add diff to patches folder

slock.c

@@ -19,6 +19,7 @@
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
 #include <X11/XKBlib.h>
+#include <X11/XF86keysym.h>
 
 #include "arg.h"
 #include "util.h"
@@ -163,6 +164,18 @@ readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
 			    IsPrivateKeypadKey(ksym))
 				continue;
 			switch (ksym) {
+      case XF86XK_AudioPlay:
+      case XF86XK_AudioStop:
+      case XF86XK_AudioPrev:
+      case XF86XK_AudioNext:
+      case XF86XK_AudioRaiseVolume:
+      case XF86XK_AudioLowerVolume:
+      case XF86XK_AudioMute:
+      case XF86XK_AudioMicMute:
+      case XF86XK_MonBrightnessDown:
+      case XF86XK_MonBrightnessUp:
+        XSendEvent(dpy, DefaultRootWindow(dpy), True, KeyPressMask, &ev);
+        break;
 			case XK_Return:
 				passwd[len] = '\0';
 				errno = 0;