Split Notes into FAQ and Recipes

Notes was always a bit of a "vague" section and half of it felt like
FAQs. Hopefully this is a little more consistent

docs/faq.rst

@@ -84,3 +84,77 @@ suppress the warnings you've got a couple of options:
    Refer to the :mod:`warnings` module documentation for more refined ways to
    filter out specific warning classes.
 
+
+How can I tell what version of gpiozero I have installed?
+=========================================================
+
+The gpiozero library relies on the setuptools package for installation
+services.  You can use the setuptools ``pkg_resources`` API to query which
+version of gpiozero is available in your Python environment like so:
+
+.. code-block:: pycon
+
+    >>> from pkg_resources import require
+    >>> require('gpiozero')
+    [gpiozero 1.3.2 (/usr/lib/python3/dist-packages)]
+    >>> require('gpiozero')[0].version
+    '1.3.2'
+
+If you have multiple versions installed (e.g. from ``pip`` and ``apt``) they
+will not show up in the list returned by the ``require`` method. However, the
+first entry in the list will be the version that ``import gpiozero`` will
+import.
+
+If you receive the error "No module named pkg_resources", you need to install
+the ``pip`` utility. This can be done with the following command in Raspbian:
+
+.. code-block:: console
+
+    $ sudo apt install python-pip
+
+Alternatively, install pip with `get-pip`_.
+
+.. _get-pip: https://pip.pypa.io/en/stable/installing/
+
+
+.. _keep-your-script-running:
+
+How do I keep my script running?
+================================
+
+The following script looks like it should turn an LED on::
+
+    from gpiozero import LED
+
+    led = LED(17)
+    led.on()
+
+And it does, if you're using the Python (or IPython or IDLE) shell. However,
+if you saved this script as a Python file and ran it, it would flash on
+briefly, then the script would end and it would turn off.
+
+The following file includes an intentional :func:`~signal.pause` to keep the
+script alive::
+
+    from gpiozero import LED
+    from signal import pause
+
+    led = LED(17)
+    led.on()
+    pause()
+
+Now the script will stay running, leaving the LED on, until it is terminated
+manually (e.g. by pressing Ctrl+C). Similarly, when setting up callbacks on
+button presses or other input devices, the script needs to be running for the
+events to be detected::
+
+    from gpiozero import Button
+    from signal import pause
+
+    def hello():
+        print("Hello")
+
+    button = Button(2)
+    button.when_pressed = hello
+    pause()
+