add layout

src/XMonad/Custom/Layout.hs

@@ -0,0 +1,13 @@
+module XMonad.Custom.Layout (myLayout) where
+
+import XMonad.Layout
+import XMonad.Layout.ThreeColumns
+
+myLayout :: Choose Tall (Choose (Mirror Tall) (Choose Full ThreeCol)) a
+myLayout = tiled ||| Mirror tiled ||| Full ||| threeCol
+  where
+    threeCol = ThreeColMid nmaster delta ratio
+    tiled    = Tall nmaster delta ratio
+    nmaster  = 1      -- Default number of windows in the master pane
+    ratio    = 1/2    -- Default proportion of screen occupied by master pane
+    delta    = 3/100  -- Percent of screen to increment by when resizing panes

xmonad-custom.cabal

@@ -14,6 +14,7 @@ library
                    XMonad.Custom.SystemKeyBindings
                    XMonad.Custom.ProgramWorkSpaces
                    XMonad.Custom.UniversitySetup
+                   XMonad.Custom.Layout
   hs-source-dirs:  src
   ghc-options:     -funbox-strict-fields -Wall -Wno-unused-do-bind
   build-depends:   base