fix #1167: Added installation.rst to docs (#1170)

* Added installation.rst to docs

* Removed _installation_ section from index.rst

Author: DON-BRAN

docs/index.rst

@@ -25,44 +25,13 @@ Zarr is still a young project. Feedback and bug reports are very welcome, please
 the `GitHub issue tracker <https://github.com/zarr-developers/zarr-python/issues>`_. See
 :doc:`contributing` for further information about contributing to Zarr.
 
-Installation
-------------
-
-Zarr depends on NumPy. It is generally best to `install NumPy
-<https://numpy.org/doc/stable/user/install.html>`_ first using whatever method is most
-appropriate for you operating system and Python distribution. Other dependencies should be
-installed automatically if using one of the installation methods below.
-
-Install Zarr from PyPI::
-
-    $ pip install zarr
-
-Alternatively, install Zarr via conda::
-
-    $ conda install -c conda-forge zarr
-
-To install the latest development version of Zarr, you can use pip with the
-latest GitHub main::
-
-    $ pip install git+https://github.com/zarr-developers/zarr-python.git
-
-To work with Zarr source code in development, install from GitHub::
-
-    $ git clone --recursive https://github.com/zarr-developers/zarr-python.git
-    $ cd zarr-python
-    $ python setup.py install
-
-To verify that Zarr has been fully installed, run the test suite::
-
-    $ pip install pytest
-    $ python -m pytest -v --pyargs zarr
-
 Contents
 --------
 
 .. toctree::
     :maxdepth: 2
 
+    installation
     tutorial
     api
     spec

docs/installation.rst

@@ -0,0 +1,31 @@
+Installation
+============
+
+Zarr depends on NumPy. It is generally best to `install NumPy
+<https://numpy.org/doc/stable/user/install.html>`_ first using whatever method is most
+appropriate for you operating system and Python distribution. Other dependencies should be
+installed automatically if using one of the installation methods below.
+
+Install Zarr from PyPI::
+
+    $ pip install zarr
+
+Alternatively, install Zarr via conda::
+
+    $ conda install -c conda-forge zarr
+
+To install the latest development version of Zarr, you can use pip with the
+latest GitHub main::
+
+    $ pip install git+https://github.com/zarr-developers/zarr-python.git
+
+To work with Zarr source code in development, install from GitHub::
+
+    $ git clone --recursive https://github.com/zarr-developers/zarr-python.git
+    $ cd zarr-python
+    $ python setup.py install
+
+To verify that Zarr has been fully installed, run the test suite::
+
+    $ pip install pytest
+    $ python -m pytest -v --pyargs zarr