added conda installation in docs

doc/installation.rst

@@ -70,6 +70,38 @@ be solved by installing the *gcc* compiler shipped with AnaConda (as well as
     conda install gxx_linux-64 gcc_linux-64 swig
 
 
+Conda-forge
+~~~~~~~~~~~
+
+Installing `auto-sklearn` from the `conda-forge` channel can be achieved by adding `conda-forge` to your channels with:
+
+.. code:: bash
+
+    conda config --add channels conda-forge
+
+    conda config --set channel_priority strict
+
+
+Once the `conda-forge` channel has been enabled, `auto-sklearn` can be installed with:
+
+.. code:: bash
+
+    conda install auto-sklearn
+
+
+It is possible to list all of the versions of `auto-sklearn` available on your platform with:
+
+.. code:: bash
+
+    conda search auto-sklearn --channel conda-forge
+
+to read in more details check
+`auto sklearn feedstock <https://github.com/conda-forge/auto-sklearn-feedstock>`_.
+
+for more information about Conda forge check
+`conda-forge documentations <https://conda-forge.org/docs/>`_.
+
+
 Windows/OSX compatibility
 =========================
 
@@ -87,6 +119,7 @@ Possible solutions (not tested):
 * virtual machine
 * docker image
 
+
 Mac OSX
 ~~~~~~~