Add factory patterns to docs

Author: rmk135

docs/examples/chained_factories.rst

@@ -0,0 +1,22 @@
+Chained Factories pattern
+=========================
+
+This example demonstrate implementation of "Chained Factories" pattern.
+Main idea of this pattern is about wrapping `Factory` into other `Factory`
+that mix additional arguments or keyword arguments to a wrapped one.
+
+Listing of ``data.py``, demonstrates sample classes structure:
+
+.. literalinclude:: ../../examples/miniapps/factory_patterns/data.py
+   :language: python
+   :linenos:
+
+Listing of ``chained_factories.py``, demonstrates "Chained Factories"
+pattern and provide some explanation:
+
+.. literalinclude:: ../../examples/miniapps/factory_patterns/chained_factories.py
+   :language: python
+   :linenos:
+
+
+.. disqus::

docs/examples/factory_of_factories.rst

@@ -0,0 +1,22 @@
+Factory of Factories pattern
+============================
+
+This example demonstrate implementation of "Factory of Factories" pattern.
+Main idea of this pattern is about creation of a :py:class:`Factory` that
+creates another :py:class:`Factory` and mix additional arguments to it.
+
+Listing of ``data.py``, demonstrates sample classes structure:
+
+.. literalinclude:: ../../examples/miniapps/factory_patterns/data.py
+   :language: python
+   :linenos:
+
+Listing of ``factory_of_factories.py``, demonstrates "Chained Factories"
+pattern and provide some explanation:
+
+.. literalinclude:: ../../examples/miniapps/factory_patterns/factory_of_factories.py
+   :language: python
+   :linenos:
+
+
+.. disqus::

docs/examples/index.rst

@@ -21,3 +21,5 @@ and powered by *Dependency Injector* framework.
     bundles_miniapp
     use_cases_miniapp
     password_hashing_miniapp
+    chained_factories
+    factory_of_factories