Created Getting deal.II (markdown)

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+# Introduction
+
+deal.II is somewhat difficult to install especially if you are new to it and
+if you need additional dependencies for parallel computations (p4est,
+Trilinos, PETsc, etc.). There are various different ways to acquire deal.II and
+its (optional) dependencies and the number of choices can be overwhelming. This document tries to help you navigating the
+different options.
+
+Please follow the following guidelines:
+
+1. Are you happy with latest release of deal.II? If yes, go to the next
+   point. If you want to work on deal.II itself, you will need the latest
+   development version. Go to #development.
+
+2. Are you just trying things out and learning how to use deal.II? If yes, try
+   #VM or if you are confortable using docker, try #docker. Otherwise go to
+   the next point.
+
+3. Is your machine running Windows? See #Windows. Are you running
+   MacOS? You can use the prebuilt package, see #MacOS.
+
+4. Are you running Ubuntu/Debian/Arch/Gentoo/..., consider installing a #Linux
+   package.
+
+5. If you need additional dependencies (MPI, Trilinos, p4est, PETSC, ...) it
+   is easier to use a source-based installer like #candi or #spack. Otherwise,
+   go to the next point.
+
+6. Download the source code to deal.II (.tar.gz file from the latest 
+     https://github.com/dealii/dealii/releases
+   and go to "Installation from source".
+
+7. None of this works or still lost? Contact us at https://www.dealii.org/mail.html
+
+# Installation from source
+  Download a .tar.gz with the source from
+  https://github.com/dealii/dealii/releases or clone the git repository (``
+  git clone https://github.com/dealii/dealii.git``) and proceed with
+  installation as described at
+  https://www.dealii.org/current/readme.html#installation
+
+# VM
+ Install VirtualBox on your Windows/MacOS/Linux machine and download the
+ virtual machine image from https://www.math.clemson.edu/~heister/dealvm/
+
+# docker
+  After you install docker on your machine, you can download and run
+  precompiled docker images. See https://github.com/dealii/docker-files for
+  more information.
+
+# Development version
+  - You can use the VM or windows WSL, but most of us run Linux (or MacOS) natively.
+  - You will need to install deal.II from source. See "Development sources" at
+    https://www.dealii.org/download.html
+  - What dependencies you need depends on what you are trying to do. You can
+    install dependencies in several different ways: manually, using the
+    Debian/Ubuntu or other packages, using candi, or using spack
+
+# Windows:
+  Instructions: https://github.com/dealii/dealii/wiki/Windows
+
+  If you are running Windows 10, we recommend using the WSL as this allows you
+  to use the Debian/Ubuntu packages and run with MPI and other
+  dependencies. Alternatively, you can compile deal.II natively under Visual
+  Studio, but there is limited support for other dependencies (MPI, TBB,
+  PETSc, Trilinos).  
+
+  Note that WSL practically work like a Linux machine (with a few quirks such
+  as graphical user interfaces), so you can install dependencies (and deal.II)
+  from source or using candi or spack.
+
+# MacOS
+  We provide a binary package (.dmg) as part of each of the releases, see
+  https://github.com/dealii/dealii/releases and download and install it.
+  For more details see https://github.com/dealii/dealii/wiki/MacOSX
+
+  Otherwise, the .dmg is also a convenient way to aquire common dependencies
+  and installing from source is the easy, see "Installation from source".
+
+# Linux packages
+
+  We provide packages to several linux distributions as shown under 
+  "Linux distributions" at https://www.dealii.org/download.html
+
+  For example, if you are running 18.04 you can use the deal.II package using
+
+```
+export REPO=ppa:ginggs/deal.ii-9.2.0-backports
+
+apt-get update && apt-get install -y software-properties-common && add-apt-repository $REPO \
+&& apt-get update && apt-get install -y libdeal.ii-dev
+```
+
+If you are running 20.04 you can use the deal.II package:
+
+```
+export REPO=ppa:ginggs/deal.ii-9.2.0-backports
+
+apt-get update && apt-get install -y software-properties-common && add-apt-repository $REPO \
+&& apt-get update && apt-get install -y libdeal.ii-dev
+```
+
+# Candi
+  Candi is a tool maintained by the deal.II community to install deal.II and
+  many of the optional dependencies on a linux-like system from source and is
+  quite useful to run on clusters where you need typically need to install
+  packages manually.
+  See https://github.com/dealii/candi
+