add split pane usage comment (in case I forget)

.tmux.conf

# My Personal Tmux Configurations

# split panes using h and v
# split pane vertically   : ctrl+b, v
# split pane horizontally : ctrl+b, h
bind v split-window -h
bind h split-window -v
unbind '"'
unbind %

# reload config file (change file location to your the tmux.conf you want to use)
bind r source-file ~/.tmux.conf

# Enable mouse mode (tmux 2.1 and above)
set -g mouse on

# Copy from tmux buffer to system buffer (clipboard)
# Need to install xclip first!
bind-key -t vi-copy y copy-pipe "xclip -sel clip -i"