Generic docs need reST

Conversion of all docs to reST so that the generic docs can link easily
with the rest of the docs.

docs/notes.rst

@@ -0,0 +1,72 @@
+=====
+Notes
+=====
+
+.. currentmodule:: gpiozero
+
+.. _keep-your-script-running:
+
+Keep your script running
+========================
+
+The following script looks like it should turn an LED on::
+
+    from gpiozero import led
+
+    led = LED(2)
+    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(2)
+    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()
+
+Importing from GPIO Zero
+========================
+
+In Python, libraries and functions used in a script must be imported by name
+at the top of the file, with the exception of the functions built into Python
+by default.
+
+For example, to use the :class:`Button` interface from GPIO Zero, it
+should be explicitly imported::
+
+    from gpiozero import Button
+
+Now :class:`~gpiozero.Button` is available directly in your script::
+
+    button = Button(2)
+
+Alternatively, the whole GPIO Zero library can be imported::
+
+    import gpiozero
+
+In this case, all references to items within GPIO Zero must be prefixed::
+
+    button = gpiozero.Button(2)
+