Overhaul docs for Windows filemon install

sheesh, hopefully this is "most" of it..although definitely still not
all we need yet..

docs/base/install/windows/user.rst

@@ -0,0 +1,77 @@
+
+============
+Windows User
+============
+
+In some cases, in particular if you want to use the Rattail File
+Monitor, then you may need to consider which Windows user account the
+service will run as.
+
+
+Why It Matters
+==============
+
+Rattail File Monitor does "one thing" - it watches some folder(s) and
+when new files appear it takes action(s) on them.
+
+Most often the "action" is just to copy (or move) the file elsewhere,
+for further processing.  In some cases it may be to "copy" the file
+directly to a printer port, e.g. LPT1.
+
+Most often the "destination" for files being copied, is actually a
+Linux server, which runs the "real" Rattail-based app(s).  This server
+exposes a CIFS share via Samba, and the filemon on Windows is able to
+copy files to the CIFS share easily enough.
+
+But usually the CIFS share will have some sort of user security in
+place, so not just anyone on the network can access it.  So we must
+run the filemon service as a particular user, which *does* have access
+to the share(s), and/or any other pertinent resources.
+
+
+Choosing a Username
+===================
+
+It is recommended to use the default username of ``rattail`` unless
+you have reasons to do otherwise.
+
+However there is no magic about that username, the main advantage to
+going with it is that all Rattail docs will use it, so you won't need
+to adjust any commands etc. when setting things up.
+
+Keep in mind that this user account will need to exist on the Windows
+machine (see below) but also may effectively need to exist within
+Samba on the Linux side.  Configuration of the latter is not our focus
+here, but just know that this may be more of a "network-wide" user
+account - depending on your use case.
+
+
+Active Directory
+================
+
+As of this writing no AD integration has been attempted.
+
+Only "local machine" user accounts are supported thus far.
+
+Note that CIFS behavior is such that if you create a "local" Windows
+user with the username of ``rattail`` and password ``rattailpass``,
+and then configure a Samba user account with the same credentials,
+then things should work.  (Please use a different password of course,
+that is just for example.)
+
+
+Creating the Account
+====================
+
+You probably already know how to create a user account, but if you
+prefer you can tell Rattail to do it for you.  In an admin console
+(right-click ``cmd.exe``, run as administrator) do:
+
+.. code-block:: sh
+
+   rattail make-user --system windows rattail
+
+This will create a "local machine" Windows account, with username
+``rattail`` and the password you specify (which you will be prompted
+for).  This account will be suitable for use with the Rattail File
+Monitor service.