Adding installation to docs

Author: erikvansebille

docs/index.rst

@@ -11,6 +11,19 @@ Welcome to the documentation of PlasticParcels.
 ``plasticparcels`` is a python package for simulating the transport and dispersion of plastics in the ocean. The tool is based on the ``parcels`` computational Lagrangian ocean analysis framework, providing a modular and customisable collection of methods, notebooks, and tutorials for advecting virtual plastic particles with a wide range of physical properties.
 
 
+Installation
+^^^^^^^^^^^^
+
+``plasticparcels`` can be installed using ``conda`` from the `conda-forge channel <https://anaconda.org/conda-forge/plasticparcels>`_ with the following command:
+
+.. code-block::
+
+   conda install conda-forge::plasticparcels
+
+
+Or downloaded from https://github.com/OceanParcels/PlasticParcels
+
+
 .. toctree::
    :maxdepth: 2
    :caption: Contents