X: Add .Xdefaults file

This file should be copied to $HOME. This file can be used for
configuration of X env. Currently only emacs cursor color is
configured. This will avoid evaluating custom-init.el on emacs init
in GUI mode when invoking on Linux machine.

After editing this file, please run
$ xrdb ~/.Xdefaults for configuration reload

Tested-by: Ratheesh S <ratheeshreddy@gmail.com>
Signed-off-by: Ratheesh S <ratheeshreddy@gmail.com>
Git: add git-send-email options in config file

Tested-by: Ratheesh S <ratheeshreddy@gmail.com>
Signed-off-by: Ratheesh S <ratheeshreddy@gmail.com>
Common: Edit readme.md file

Add X entry.
Correct text formatting in the table(space->TAB).

Signed-off-by: Ratheesh S <ratheeshreddy@gmail.com>
Emacs: Enable conf-mode for tmux conf file

Tested-by: Ratheesh S <ratheeshreddy@gmail.com>
Signed-off-by: Ratheesh S <ratheeshreddy@gmail.com>
Emacs:disable footnote-init by default

Disable footnote-init package as it is throwing
buffer-substring-no-properties: Wrong type argument: number-or-marker-p
, nil

Enable it only when required

Tested-by: Ratheesh S <ratheeshreddy@gmail.com>
Signed-off-by: Ratheesh S <ratheeshreddy@gmail.com>
Tmux: remove redundant status-interval statement

Tested-by: Ratheesh S <ratheeshreddy@gmail.com>
Signed-off-by: Ratheesh S <ratheeshreddy@gmail.com>