Adds Phabricator documentation. This is a first step that answers many questions we have seen.

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+.. _Phabricator:
+.. _LLVM's Phabricator: http://llvm-reviews.chandlerc.com
+.. _Code Repository Browser: http://llvm-reviews.chandlerc.com/diffusion/
+.. _Arcanist Quick Start: http://www.phabricator.com/docs/phabricator/article/Arcanist_Quick_Start.html
+.. _Arcanist User Guide: http://www.phabricator.com/docs/phabricator/article/Arcanist_User_Guide.html
+
+
+=============================
+Code Reviews with Phabricator
+=============================
+
+.. contents::
+  :local:
+
+If you prefer to use a web user interface for code reviews,
+you can now submit your patches for Clang and LLVM at
+`LLVM's Phabricator`_.
+
+Sign up
+-------
+
+Sign up with one of the supported OAuth account types. If
+you use your Subversion user name as Phabricator user name,
+Phabricator will automatically connect your submits to your
+Phabricator user in the `Code Repository Browser`_.
+
+
+Requesting a review via the command line
+----------------------------------------
+
+Phabricator has a tool called *Arcanist* to upload patches from
+the command line. To get you set up, follow the
+`Arcanist Quick Start`_ instructions.
+
+You can learn more about how to use arc to interact with
+Phabricator in the `Arcanist User Guide`_.
+
+Requesting a review via the web interface
+-----------------------------------------
+
+The tool to create and review patches in Phabricator is called
+*Differential*.
+
+Note that you can upload patches created through various diff tools,
+including git and svn. To make reviews easier, please always include
+**as much context as possible** with your diff! Don't worry, Phabricator
+will automatically send a diff with a smaller context in the review
+email, but having the full file in the web interface will help the
+reviewer understand your code.
+
+To get a full diff, use one of the following commands (or just use Arcanist
+to upload your patch):
+
+* git diff -U999999 other-branch
+* svn diff --diff-cmd=diff -x -U999999
+
+To upload a new patch:
+
+* Click *Differential*.
+* Click *Create Revision*.
+* Paste the text diff or upload the patch file.
+  Note that TODO
+* Leave the drop down on *Create a new Revision...* and click *Continue*.
+* Enter a descriptive title and summary; add reviewers and mailing
+  lists that you want to be included in the review. If your patch is
+  for LLVM, cc llvm-commits; if your patch is for Clang, cc cfe-commits.
+* Click *Save*.
+
+To submit an updated patch:
+
+* Click *Differential*.
+* Click *Create Revision*.
+* Paste the updated diff.
+* Select the review you want to from the *Attach To* dropdown and click
+  *Continue*.
+* Click *Save*.
+
+Reviewing code with Phabricator
+-------------------------------
+
+Phabricator allows you to add inline comments as well as overall comments
+to a revision. To add an inline comment, select the lines of code you want
+to comment on by clicking and dragging the line numbers in the diff pane.
+
+You can add overall comments or submit your comments at the bottom of the page.
+
+Phabricator has many useful features, for example allowing you to select
+diffs between different versions of the patch as it was reviewed in the
+*Revision Update History*. Most features are self descriptive - explore, and
+if you have a question, drop by on #llvm in IRC to get help.
+
+Status
+------
+
+Currently, we're testing Phabricator for use with Clang/LLVM. Please let us
+know whether you like it and what could be improved!