Update readme

README.md

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 # dothome
-Simple dot files manager bash script
+Simple dot files manager script that requires Bash version 4 or higher.
+
+```bash
+Usage: ./dothome [ -b | --base <DIR> ] [ -d | --dotfiles <NAME> ] [ -n | --new ] [ -i | --init ] [ -a | --add <FILE> ] [ -h | --help ]
+Simple dot files manager.
+        -b,--base <DIR>         Base directory to use for operations. Default: '/home/onur'
+        -d,--dotfiles <NAME>    Name of a directory relative to base directory to use for operations. Default: 'dotfiles'
+        -n,--new                Create new dot files directory under base directory.
+        -i,--init               Link files from dot files directory to their relative locations under base directory.
+        -a,--add <FILE>         Move given file to dot files directory and create link under base directory.
+        -h,--help               Display help.
+```
+
+## How It Works
+It uses `${HOME}` as default base directory and takes with `-d` a relative directory name to use as dot files directory.
+Basically reflects the home folder structure under dot files directory and links related files to their dot files directory version.
+Converts names start with '.' to a version starts with 'dot.' under dot files to not having hidden files under dot files.
+
+### New
+Creates a new dot files directory.
+
+### Add
+Moves given file to dot files directory then creates link to the original location.
+The moved version of the file starts with 'dot.' if it starts with '.'
+
+### Init
+Creates links relative to dot files location under base directory.
+If there is already created dot files then it is  possible to link files under home with this option.