Docs on installing

Author: jarofgreen

docs/index.rst

@@ -10,5 +10,6 @@ It is Python tool that can be used as a library from other Python programmes, or
 .. toctree::
 
    features.rst
+   installing.rst
    cli.rst
 

docs/installing.rst

@@ -0,0 +1,27 @@
+Installing
+==========
+
+To install,
+
+1) Check out the git repository ( https://github.com/OpenDataServices/compile-to-json-schema ) onto your machine.
+
+2) In that directory, create a new Python Virtual Environment (or similar, using the tool of your choice).
+
+3) To install the tool and it's dependencies, run:
+
+.. code-block:: shell-session
+
+    pip install -e .
+
+If you will want to develop the tool, instead run:
+
+.. code-block:: shell-session
+
+    pip install -e .[test]
+
+4) The tool should now be available! Run
+
+
+.. code-block:: shell-session
+
+    compiletojsonschema --help