Created Installation (markdown)

Installation.md

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+# Windows
+1. Download the latest version of Lidarr from [https://lidarr.audio](https://lidarr.audio "https://lidarr.audio")
+* Extract the zip file into your target directory. Use a folder that Lidarr process would have write access to (**DO NOT** use `C:\Program Files` or `C:\Program Files (x86)`)
+* Run `Lidarr.exe` once as administrator to register the port and URL with Windows (Required for remote access)<sup>1</sup>
+* Manually start Lidarr by running `Lidarr.exe` or `ServiceInstall.exe` to install Lidarr as a Windows service.
+* Open [http://localhost:8686](http://localhost:8686) in your browser
+
+
+<sup>1</sup> The port will be opened on the firewall (if enabled) for the private profile only, if you're connected to a domain or a public network the port will not be opened automatically, but can be done so manually.
+
+# Docker #
+#### Docker is available on Linux, macOS and Windows ####
+
+Running Lidarr in a Docker container eases setup and reduces package installation on the host OS. Docker is available on many platforms see the [Docker overview page](https://www.docker.com/products/overview) and install Docker before setting up a Lidarr under Docker. Once Docker is installed you'll need to want to pull the image with `docker pull linuxserver/lidarr ` and then create the container. See https://hub.docker.com/r/linuxserver/lidarr/ for the options available when creating the image.