Update README a bit and add Contributing info

README

Index: README
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-This package contains tools for working with Chromium development.
-
-The "gclient" wrapper knows how to keep this repository updated to
-the latest versions of these tools as found at:
-
-    https://chromium.googlesource.com/chromium/tools/depot_tools/+/master/gclient.py
-
-This package contains:
-
-  chrome-update-create-task.bat
-    Creates a scheduled task to do an automatic local chromium build every day.
-
-  cpplint.py
-    A copy of our linting tool which enforces Google style. Fetched from
-    http://google-styleguide.googlecode.com/svn/trunk/cpplint/cpplint.py
-
-  gcl
-    A tool for uploading and managing code reviews on the Chromium
-    project, using the Rietveld code review tool.  More info at:
-    http://code.google.com/p/rietveld/
-
-  gclient
-    A script for managing a workspace with modular dependencies that
-    are each checked out independently from different repositories.
-    More info at:
-    http://code.google.com/p/gclient/
-
-Note: svn and python will be installed automatically if not accessible (on
-Windows only).
-
-To update this distribution manually, run .\update_depot_tools.bat on Windows,
-or ./update_depot_tools on Linux or Mac.
-
-To disable automatic updating, set the environment variable DEPOT_TOOLS_UPDATE=0