Port README to markdown

Also add instructions for Arch-Linux.

README.md

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+F-Droid Server
+==============
+
+Server for [F-Droid](https://f-droid.org), the Free Software repository system
+for Android.
+
+The F-Droid server tools provide various scripts and tools that are used to
+maintain the main [F-Droid application repository](https://f-droid.org/repository/browse).
+You can use these same tools to create your own additional or alternative
+repository for publishing, or to assist in creating, testing and submitting
+metadata to the main repository.
+
+For documentation, please see the docs directory.
+
+Alternatively, visit [https://f-droid.org/manual/](https://f-droid.org/manual/).
+
+What is F-Droid?
+----------------
+
+F-Droid is an installable catalogue of FOSS (Free and Open Source Software)
+applications for the Android platform. The client makes it easy to browse,
+install, and keep track of updates on your device.
+
+Installing
+----------
+
+The easiest way to install the `fdroidserver` tools is on Ubuntu, Mint or other
+Ubuntu based distributions, you can install using:
+
+```
+sudo apt-get install fdroidserver
+```
+
+For older Ubuntu releases or to get the latest version, you can get
+`fdroidserver` from the Guardian Project PPA (the signing key
+fingerprint is `6B80 A842 07B3 0AC9 DEE2 35FE F50E ADDD 2234 F563`)
+
+```
+sudo add-apt-repository ppa:guardianproject/ppa
+sudo apt-get update
+sudo apt-get install fdroidserver
+```
+
+On OSX, `fdroidserver` is available from third party package managers,
+like Homebrew, MacPorts, and Fink:
+
+```
+sudo brew install fdroidserver
+```
+
+For Arch-Linux is a package in the AUR available. If you have installed
+`yaourt` or something similiar, you can do:
+
+```
+yaourt -S fdroidserver
+```
+
+For any platform where Python's `easy_install` is an option (e.g. OSX
+or Cygwin, you can use it:
+
+```
+sudo easy_install fdroidserver
+```
+
+Python's `pip` also works:
+
+```
+sudo pip install fdroidserver
+```
+
+The combination of `virtualenv` and `pip` is great for testing out the
+latest versions of `fdroidserver`.  Using `pip`, `fdroidserver` can
+even be installed straight from git.  First, make sure you have
+installed the python header files, virtualenv and pip.  They should be
+included in your OS's default package manager or you can install them
+via other mechanisms like Brew/dnf/pacman/emerge/Fink/MacPorts.
+
+For Debian based distributions:
+
+```
+apt-get install python-dev python-pip python-virtualenv
+```
+Then here's how to install:
+
+```
+git clone https://gitlab.com/fdroid/fdroidserver.git
+cd fdroidserver
+virtualenv env/
+source env/bin/activate
+pip install -e .
+python2 setup.py install
+```