Add some quickstart docs (applegrew#467)

Add some quickstart docs to make it easy for someone to pick up the library and get going
straight away.

Author: intiocean

docs/get_started.rst

@@ -23,6 +23,34 @@ Installation
 
         url(r'^select2/', include('django_select2.urls')),
 
+Quick Start
+-----------
+
+Here is a quick example to get you started:
+
+0. Follow the installation instructions above.
+
+1. Add a select2 widget to the form. For example if you wanted Select2 with multi-select you would use
+``Select2MultipleWidget``
+Replacing::
+
+        class MyForm(forms.Form):
+            things = ModelMultipleChoiceField(queryset=Thing.objects.all())
+
+with::
+
+        class MyForm(forms.Form):
+            things = ModelMultipleChoiceField(queryset=Thing.objects.all(), widget=Select2MultipleWidget)
+
+2. Add the CSS to the ``head`` of your Django template::
+
+        {{ form.media.css }}
+
+3. Add the JavaScript to the end of the ``body`` of your Django template::
+
+        {{ form.media.js }}
+
+4. Done - enjoy the wonders of Select2!
 
 External Dependencies
 ---------------------