Add install instructions

Install.md

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+# Installing Libreboard
+Welcome to the guide how to install Libreboard on your own Server! There are various ways to do so, just choose one of the following options:
+
+## Install using Docker
+You can install using the official Docker repository located [here][docker-repo].
+
+## Install with Sandstorm
+Sandstorm is a platform that you can install of your server and it lets you install a variety of apps easily, most of the with a one-click installation.  
+For instructions how to install Sandstorm, check out the [guide][sandstorm-guide] on their website! After you have installed Sandstorm, just go to the Admin panel and install the Libreboard app! That's all!
+
+## Install manually
+This is the most complex way, suitable if you know what you are doing and want to have the most flexibility to adapt the installation to your needs. Let's go!
+
+### Install Node.js
+If you haven't already, you need to install Node.js, given that we need a very recent version, make sure to either use the [custom packages][node-packages] (the ones of your OS are likely too old) or install the latest version from the Node.js [website][node-web].
+
+### Install Meteor
+As you might have noticed already, Libreboard is built using the Meteor web framework, so we need to install this as well. This can be done easily using their install script ([read it][meteor-script] if you don't trust it):
+
+```sh
+# This will install Meteor to ~/.meteor
+curl https://install.meteor.com/ | sh
+```
+
+### Install MongoDB
+
+In order to run Libreboard you need to have MongoDB installed. You can either install your distributions package, if they offer any or see the [MongoDB website] how to install it.
+
+### Download and build Libreboard
+First we need to get the latest version of Lireboard and change to the cloned folder:
+
+```sh
+git clone https://github.com/libreboard/libreboard.git && cd libreboard
+```
+
+Now we need to build the meteor app:
+
+```sh
+meteor build .build --directory
+```
+We use `.build` here, as it will be ignored by meteor on subsequent builds, you can as well use a directory outside the libreboard folder.
+
+Now we need to cd into the build server folder and install some dependencies:
+
+```sh
+cd .build/bundle/programs/server/ && sudo npm install
+```
+
+Now we need to set some environment variables:
+
+```sh
+export MONGO_URL='mongodb://127.0.0.1:27017/libreboard'
+export ROOT_URL='https://example.com'
+export MAIL_URL='smtp://user:pass@mailserver.example.com:25/'
+export PORT=8080
+```
+
+Most of them should be self-explaining. After having set the variables, let's move back to the build package folder and start the server:
+
+```sh
+cd ../../../
+node main.js
+```
+
+Done!
+
+[docker-repo]: https://registry.hub.docker.com/u/ncarlier/libreboard/dockerfile/
+[sandstorm-guide]: https://sandstorm.io/install/
+[node-packages]: https://github.com/joyent/node/wiki/Installing-Node.js-via-package-manager
+[node-web]: https://nodejs.org/download
+[meteor-script]: https://install.meteor.com/
+[mongodb-website]: https://www.mongodb.org/downloads