update README

README.txt

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+Dotfiles
+========
+
+
+First Principle
+---------------
+
+
+__Do not go out of ways how the default environments work__.
+
+
+There are many cases when I must work on foreign environments, and it is always
+VERY irritating when things will not work as I expect, yet setting up my own
+environment will be troublesome. So I avoid changing behaviors of tools,
+except for emacs.
+
+Emacs is the editor I usually use for coding. I decided to change the behavior
+of emacs as I want without thinking about other environments. When I cannot use
+my emacs.el I'll use vi or vim instead.
+
+Other tools like bash and vim basically work in the same ways even when using my
+rc files. The main changes are related to showing informations, typically the
+bash prompt.
+
+
+Sourcing flow
+-------------
+
 ~/.bash_profile           <= console login
 |
 |--~/.dotfiles/profile