Added Tmux configuration

Tmux.md

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+# tmux cheatsheet
+
+start new:
+
+    tmux
+
+start new with session name:
+
+    tmux new -s myname
+
+attach:
+
+    tmux a  #  (or at, or attach)
+
+attach to named:
+
+    tmux a -t myname
+
+list sessions:
+
+    tmux ls
+
+kill session:
+
+    tmux kill-session -t myname
+
+In tmux, hit the prefix `ctrl+b` and then:
+
+## Sessions
+
+    :new<CR>  new session
+    s  list sessions
+    $  name session
+
+## Windows (tabs)
+
+    c           new window
+    ,           name window
+    w           list windows
+    f           find window
+    &           kill window
+    .           move window - prompted for a new number
+    :movew<CR>  move window to the next unused number
+
+## Panes (splits)
+
+    \  horizontal split
+    -  vertical split
+    
+    o  swap panes
+    q  show pane numbers
+    x  kill pane
+    ⍽  space - toggle between layouts
+
+## Misc
+
+    d  detach
+    t  big clock
+    ?  list shortcuts
+    :  prompt
+
+Resources:
+
+* [Based on henrik config](https://gist.github.com/henrik/1967800)
+* [cheat sheet](http://cheat.errtheblog.com/s/tmux/)

dotfiles/tmux.conf

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+# Start window and pane indices at 1.
+set -g base-index 1
+set -g pane-base-index 1
+
+# Status bar styling and content.
+set -g status-bg black
+set -g status-fg white
+set -g status-left '#S '
+
+# Highlight the active window in the status bar.
+set-window-option -g window-status-current-bg cyan
+set-window-option -g window-status-current-fg black
+
+# Don't prompt to kill panes/windows.
+bind-key x kill-pane
+bind-key & kill-window
+
+# More intuitive split-window mappings.
+bind "\\" split-window -h
+bind - split-window -v
+
+# Maximize pane, e.g. for copying.
+bind-key z resize-pane -Z
+
+# Reload tmux conf.
+unbind r
+bind r source-file ~/.tmux.conf\; display "Reloaded conf."