[doc] Updated installation instructions.

doc/installation.rst

@@ -3,25 +3,58 @@
 Installation
 ============
 
-For now, no binaries are provided. Installation must be made
-directly by compiling the source.
-It requires Ocaml package manager Opam, v2.1 or higher.
+The latest release of CAISAR is available as an
+`opam <https://opam.ocaml.org/>`_ package or
+a `Docker <https://www.docker.com/>`_ image.
 
+The development version of CAISAR is available only by compiling the source code.
 
-For development, it is recommended you set-up your own
-Opam switch (an OCaml installation isolated from system
-libraries)::
+Install through Opam
+--------------------
 
-  git clone https://git.frama-c.com/pub/laiser/caisar.git && cd caisar
-  opam switch create --yes --no-install . ocaml-base-compiler.4.13.1  
+**Please note:** CAISAR requires the OCaml package manager
+(Opam) v2.1 or higher, which is typically avaible in all major
+GNU/Linux distributions.
 
-Install external dependencies:::
+To install CAISAR via opam, do the following:
 
-  opam depext --yes ocplib-endian base fmt alt-ergo.2.4.0  
-  opam install . --deps-only --with-test --yes  
+``$ opam install caisar``
 
-Finally, run the compilation and the unit tests:::
+Install through Docker
+----------------------
 
-  make  
-  make test  
+This method requires Docker to be installed in your system.
+A ready-to-use Docker image of CAISAR is available on
+`Docker Hub <https://hub.docker.com>`_. To retrieve it, do the
+following:
 
+``$ docker pull laiser/caisar:pub``
+
+Alternatively, a Docker image for CAISAR can be
+created locally by proceeding as follows:
+
+::
+
+$ git clone https://git.frama-c.com/pub/caisar
+$ cd caisar
+$ make docker
+
+To run the CAISAR Docker image, do the following:
+``$ docker run -it laiser/caisar:pub sh``
+
+Compile from source
+-------------------
+
+To build and install CAISAR, do the following:
+
+::
+
+$ git clone https://git.frama-c.com/pub/caisar
+$ cd caisar
+$ opam switch create --yes --no-install . 4.13.1
+$ opam install . --deps-only --with-test --yes
+$ make
+$ make install
+
+To run the tests:
+``$ make test``