add introduction

cpt-context.rst

@@ -1,3 +1,4 @@
 Contextualization
 =================
 
+

cpt-launch.rst

@@ -1,3 +1,8 @@
 How to Instantiate a CernVM
 ===========================
 
+Download the latest images from our
+`downloads page <https://cernvm.cern.ch/portal/downloads>`_.
+The image is generic and available in different file formats for different
+hypervisors. The image needs to be contextualized to become either a graphical
+development VM or a batch virtual machine for the cloud.

cpt-releasenotes.rst

@@ -1,3 +1,13 @@
-Release Notes for CernVM 4.4
-============================
+Release Notes
+=============
 
+CernVM 4.3
+----------
+CernVM 4.3 is a minor update to CernVM 4.2. It upgrades the base system to
+EL 7.7 and provides new versions of the docker and eos packages. Note that in
+the course of the EOS update, that eosd daemon disappeared. Instead, eos mounts
+are now autofs managed, in the same way they are on CERN lxplus.
+
+CernVM 4.2
+----------
+CernVM 4.2 is a minor update to CernVM 4.1, upgrading the base system to EL 7.6.

index.rst

@@ -6,6 +6,17 @@ Welcome to CernVM Virtual Machine documentation!
 What is the CernVM Virtual Machine?
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
+CernVM is a virtual machine image based on CentOS combined with a custom,
+virtualization-friendly Linux kernel.
+
+CernVM is based on the `µCernVM bootloader <https://arxiv.org/abs/1311.2426>`_.
+Its outstanding feature is that it does not require a hard disk image to be
+distributed (hence "micro"). Instead it is distributed as a read-only image of
+~20MB containing a Linux kernel and the CernVM-FS client. The rest of the
+operating system is downloaded and cached on demand by CernVM-FS. The virtual
+machine still requires a hard disk as a persistent cache, but this hard disk is
+initially empty and can be created instantaneously.
+
 Contents
 ^^^^^^^^