convert the README to markdown

Author: rgl

README.md

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+# Elasticsearch Setup
+
+This is a setup application for installing [Elasticsearch](https://www.elastic.co/products/elasticsearch)
+on a Windows machine.
+
+The setup will:
+
+ * install all files into `Program Files` (the user can change the
+   actual location)
+
+ * create the `elasticsearch` Windows account (with
+   `Logon as service privilege`)
+
+ * install a Windows Service to automatically start `elasticsearch`
+   (run as the `elasticsearch` account) at boot (but has to be manually
+   started after install...).
+
+ * grant the `elasticsearch` account:
+     * read permissions to the `config` directory.
+     * full permissions to the `data` and `logs` directories.
+
+ * create a bunch of Start Menu entries (link to home page, guide, etc).
+
+
+If you need to modify any service related setting (e.g. the maximum
+memory used by the JVM) edit the file:
+
+    lib\elasticsearchw-update.cmd
+
+And then run it in a Administrator Command Prompt.
+
+## Silent installation
+
+You can do a silent install with the `/VERYSILENT /SUPPRESSMSGBOXES` command
+line arguments. For more information see the `install elasticsearch` section
+inside the [Vagrantfile-provision.ps1](Vagrantfile-provision.ps1) file.
+
+# Development
+
+The setup is created inside a Vagrant environment. To create the
+environment install:
+
+ * [Vagrant](https://www.vagrantup.com/)
+ * [VirtualBox](https://www.virtualbox.org/)
+ * [Windows Base Box](https://github.com/rgl/windows-2016-vagrant)
+
+Then run `vagrant up`. The setup executable should appear on the
+same directory as this README file.