update README

README.md

@@ -1,3 +1,25 @@
 # etools
 
-bash library for gentoo utils
+bash library for gentoo utils
+
+## How to use
+
+`. etools`
+
+## Configuration
+
+etools searches for a configuration file at the following locations:
+`/etc/etools/etools.conf`
+`$HOME/.config/etools.conf`
+`$HOME/.config/etools/etools.conf`
+
+## What it does
+
+provided function are the following:
+`einfo <info>`
+`ewarn <warning>`
+`eerror <error>`
+`etools_configure`
+`etools_unset`
+`etools_smart_find <package name> [repo]`
+