add installation instruction from wheelhouse

doc/source/install.rst

@@ -4,7 +4,18 @@ Installation
 
 *X-SOCS* supports `Python <https://www.python.org/>`_ versions >= 3.4 (recommended) and 2.7.
 
-At the moment *X-SOCS* can only be installed from the source, see `Installing from source`_.
+Binary wheels of the latest development version of X-SOCS are available for Linux and Windows (for python >= 3.6) in the *X-SOCS* `wheelhouse <https://kmap.gitlab-pages.esrf.fr/xsocs/wheels/>`_.
+
+To install *X-SOCS* with minimal dependency (to use from scripts)::
+
+    pip install --pre --find-links https://kmap.gitlab-pages.esrf.fr/xsocs/wheels/ xsocs [--user]
+
+or with graphical user interface dependencies::
+
+    pip install --pre --find-links https://kmap.gitlab-pages.esrf.fr/xsocs/wheels/ xsocs[gui] [--user]
+
+.. note::
+   The ``--user`` optional argument installs X-SOCS for the current user only.
 
 Dependencies
 ------------
@@ -59,5 +70,3 @@ or with all graphical user interface dependencies::
 
     pip install .[gui] [--user]
 
-.. note::
-   The ``--user`` optional argument installs X-SOCS for the current user only.