Merge pull request #52 from Cadair/install_docs

Update the install docs to link to sunpy core

docs/installing.rst

@@ -2,14 +2,22 @@
 Installing
 **********
 
-``sunkit_magex`` can be installed from PyPI using
+If you need to install Python, you should start by following the :external+sunpy:ref:`sunpy core installation guide <sunpy-tutorial-installing>`.
+
+``sunkit-magex`` can then be installed with conda:
+
+.. code:: shell
+
+    conda install -c conda-forge sunkit-magex
+
+Alternatively ``sunkit-magex`` can be installed from PyPI using:
 
 .. code:: shell
 
     pip install sunkit-magex
 
 This will install sunkit_magex and all of its dependencies.
-In addition to the core dependencies, there are two optional dependencies (numba, streamtracer) that can improve code performance.
+In addition to the core dependencies, there are optional dependencies (numba, streamtracer) that can improve code performance.
 These can be installed with
 
 .. code:: shell