First set of minimal docs for the new Markdown server.

site/user/download.md

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+How to download Skia
+====================
+
+Install gclient and git
+-----------------------
+
+Follow the instructions on
+http://www.chromium.org/developers/how-tos/install-depot-tools to download
+chromium's depot_tools (which includes gclient ).
+
+depot_tools will also install git on your system, if it wasn't installed
+already.
+
+
+
+Configure git
+-------------
+
+    $ git config --global user.name "Your Name"
+    $ git config --global user.email you@example.com
+
+Download your tree
+------------------
+
+    $ mkdir skia
+    $ cd skia
+    $ gclient config --name . --unmanaged https://skia.googlesource.com/skia.git
+    $ gclient sync
+    $ git checkout master
+
+At this point, you have everything you need to build and use Skia!  If
+you want to make changes, and possibly contribute them back to the Skia
+project, read on...
+
+Making changes
+--------------
+
+First create a branch for your changes:
+
+    $ git checkout --track origin/master -b my_feature master
+
+After making your changes, create a commit
+
+    $ git add [file1] [file2] ...
+    $ git commit
+
+If your branch gets out of date, you will need to update it:
+
+    $ git pull --rebase
+    $ gclient sync
+
+Uploading changes for review
+----------------------------
+
+    $ git cl upload
+
+You may have to enter a Google Account username and password to authenticate
+yourself to codereview.chromium.org. A free gmail account will do fine, or any
+other type of Google account.  It does not have to match the email address you
+configured using git config --global user.email above, but it can.
+
+The command output should include a URL (similar to
+https://codereview.chromium.org/111893004/ ) indicating where your changelist
+can be reviewed.
+
+Once your change has received an LGTM ("looks good to me"), you can check the
+"Commit" box on the codereview page and it will be committed on your behalf.
+
+Once your commit has gone in, you should delete the branch containing your
+change:
+
+    $ git checkout master
+    $ git branch -D my_feature
+