Add plugin documentation

doc/plugins/list.rst

@@ -0,0 +1,30 @@
+List of plugins
+===============
+
+The following plugins are shipped with pretix and are supported in the same
+ways that pretix itself is:
+
+* Bank transfer
+* PayPal
+* Stripe
+* Check-in lists
+* pretixdroid
+* Report exporter
+* Send out emails
+* Statistics
+* PDF ticket output
+
+The following plugins are not shipped with pretix but are maintained by the
+same team:
+
+* `Passbook/Wallet ticket output`_
+* `Cartshare`_
+
+The following plugins are from independent third-party authors, so we can make
+no statements about their stability:
+
+* `esPass ticket output`_
+
+.. _Passbook/Wallet ticket output: https://github.com/pretix/pretix-passbook
+.. _Cartshare: https://github.com/pretix/pretix-cartshare
+.. _esPass ticket output: https://github.com/esPass/pretix-espass