docs fixed

.readthedocs.yaml

+version: 2
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.9"
+sphinx:
+  configuration: docs/conf.py
+python:
+  install:
+    - requirements: docs/requirements.txt

docs/basics.rst

@@ -18,3 +18,24 @@ and receive them
 
 .. autoclass:: coolamqp.objects.ReceivedMessage
     :members:
+
+MessageProperties
+-----------------
+
+.. autoclass:: coolamqp.objects.MessageProperties
+    :members:
+
+.. autoclass:: coolamqp.framing.definitions.BasicContentPropertyList
+    :members:
+    :undoc-members:
+
+
+Take care, as :class:`~coolamqp.objects.MessageProperties` will hash the
+entire object (keys and values) and store it within non-GCable memory.
+
+This is done in order to facilitate reuse and speed/memory consumption.
+If you're looking forward to shipping each message with different properties,
+please wait until #51_ is fixed.
+
+.. _#51: https://github.com/smok-serwis/coolamqp/issues/51
+