Add 'tmuxconfig'

tmuxconfig

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+# Send prefix
+set-option -g prefix C-a
+unbind-key C-a
+bind-key C-a send-prefix
+
+# Use Alt-arrow keys to switch panes
+bind -n M-Left select-pane -L
+bind -n M-Right select-pane -R
+bind -n M-Up select-pane -U
+bind -n M-Down select-pane -D
+
+# Shift arrow to switch windows
+bind -n S-Left previous-window
+bind -n S-Right next-window
+
+# Mouse mode
+setw -g mouse on
+
+# Set easier window split keys
+bind-key v split-window -h
+bind-key h split-window -v
+
+# Easy config reload
+bind-key r source-file ~/.tmux.conf \; display-message "~/.tmux.conf reloaded."