refine example doc and address https://github.com/deltachat/deltachat-core-rust/pull/1307#pullrequestreview-380876587

python/doc/examples.rst

@@ -1,18 +1,18 @@
 
-
 examples
 ========
 
+Once you have :doc:`installed deltachat bindings <install>`
+you need email/password credentials for an IMAP/SMTP account.
+Delta Chat developers and the CI system use a special URL to create
+temporary e-mail accounts on [testrun.org](https://testrun.org) for testing.
 
 Receiving a Chat message from the command line
 ----------------------------------------------
 
-Once you have :doc:`installed deltachat bindings <install>`
-you can start playing from the python interpreter commandline.
+Here is a simple bot that:
 
-Here is a simple module that implements a bot that:
-
-- receives a message and sends back an "echo" message
+- receives a message and sends back ("echoes") a message
 
 - terminates the bot if the message `/quit` is sent
 
@@ -23,11 +23,35 @@ With this file in your working directory you can run the bot
 by specifying a database path, an e-mail address and password of
 a SMTP-IMAP account::
 
-    python echo_and_quit.py --db /tmp/db --email ADDRESS --password PASSWORD
+    $ cd examples
+    $ python echo_and_quit.py /tmp/db --email ADDRESS --password PASSWORD
 
 While this process is running you can start sending chat messages
 to `ADDRESS`.
 
+Track member additions and removals in a group
+----------------------------------------------
+
+Here is a simple bot that:
+
+- echoes messages sent to it
+
+- tracks if configuration completed
+
+- tracks member additions and removals for all chat groups
+
+.. include:: ../examples/group_tracking.py
+    :literal:
+
+With this file in your working directory you can run the bot
+by specifying a database path, an e-mail address and password of
+a SMTP-IMAP account::
+
+    python group_tracking.py --email ADDRESS --password PASSWORD /tmp/db
+
+When this process is running you can start sending chat messages
+to `ADDRESS`.
+
 Writing bots for real
 -------------------------