Merge pull request #25 from moretension/update-readme

Update README

README.md

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+duti 
+====
+
+duti is a command-line utility capable of setting default applications for
+various document types on [macOS](https://www.apple.com/macos/), using Apple's
+[Uniform Type
+Identifiers](https://developer.apple.com/library/content/documentation/FileManagement/Conceptual/understanding_utis/understand_utis_intro/understand_utis_intro.html)
+(UTI). A UTI is a unique string describing the format of a file's content. For
+instance, a Microsoft Word document has a UTI of `com.microsoft.word.doc`. Using
+`duti`, the user can change which application acts as the default handler for a
+given UTI.
+
+
+Compiling
+---------
+
+    ./configure
+    make
+    sudo make install
+
+
+Usage
+-----
+
+`duti` can read settings from four different sources:
+
+1. standard input
+
+1. a settings file
+
+1. an XML [property list](https://en.wikipedia.org/wiki/Property_list) (plist)
+
+1. command-line arguments.
+
+A settings line, as read in cases 1 and 2, consists of an application's bundle
+ID, a UTI, and a string describing what role the application handles for the
+given UTI. The process is similar when `duti` processes a plist. If the path
+given to `duti` on the command-line is a directory, `duti` will apply settings
+from all valid settings files in that directory, excluding files whose names
+begin with `.` (single dot).
+
+`duti` can also print out the default application information for a given
+extension (`-x`). This feature is based on public domain source code posted
+by Keith Alperin on the heliumfoot.com blog.
+
+See the man page for additional usage details.
+
+
+Examples
+--------
+
+* Set Safari as the default handler for HTML documents:
+
+    ```sh
+    duti -s com.apple.Safari public.html all
+    ```
+
+* Set TextEdit as the default handler for Word documents:
+
+    ```sh
+    echo 'com.apple.TextEdit   com.microsoft.word.doc all' | duti
+    ```
+
+* Set Finder as the default handler for ftp:// URLs:
+
+    ```sh
+    duti -s com.apple.Finder ftp
+    ```
+
+* Get default application information for .jpg files:
+
+    ```sh
+    duti -x jpg
+
+    # Output
+    Preview
+    /Applications/Preview.app
+    com.apple.Preview
+    ```
+
+Support
+-------
+
+`duti` is unsupported. You can submit bug reports and feature requests at
+the duti [GitHub project page](https://github.com/moretension).
+
+
+License
+-------
+
+`duti` was originally released into the public domain by Andrew Mortensen
+in 2008. It's provided as is without warranties of any kind. You can do
+anything you want with it. If you incorporate some or all of the code into
+another project, I'd appreciate credit for the work I've done, but that's all.
+
+Andrew Mortensen
+April 2018