some project structure clarity and additional templates

Author: sagarlf

docs/python/project_structure.md

@@ -8,9 +8,19 @@ sidebar_label: Project Structure
 
 
 * :file_folder: Project Root:
-    - :memo: pyproject.toml (can be requirements.txt and setup.py)
+    - :memo: pyproject.toml
+    - :memo: setup.py `and` :memo: setup.cfg (**OPTIONAL**)
+
+:::info
+* If not using `poetry`, `pyproject.toml` file can be omitted as `setup.py` can have dependencies as well.
+* `pyproject.toml` be used for [alternate build system](https://www.python.org/dev/peps/pep-0518/) if needed.
+:::
+
+*
     - :file_folder: docs
         * Your documentation
+    - :file_folder: bin (**OPTIONAL**) => For entrypoint scripts which calls {PROJECT_NAME}
+        + This can be generated using `setup.py` as well.
     - :file_folder: data (**OPTIONAL**)
         * Data for project.
 
@@ -21,7 +31,9 @@ sidebar_label: Project Structure
 
 :::
 *
-    - :file_folder: {PROJECT_NAME} 
+    - :file_folder: {PROJECT_NAME}
+        + :memo: __init__.py
+        + :memo: __main__.py (**OPTIONAL**)
         + :file_folder: utils
         + :file_folder: service
         + :file_folder: config
@@ -30,7 +42,7 @@ sidebar_label: Project Structure
         + :memo: conftest.py
     - :memo: LICENSE (**OPTIONAL**)
     - :memo: README (can be `md` or `rst`)
-    - :file_folder: :memo: Other configurable from third parties (**OPTIONAL**) such as tox.ini
+    - :file_folder: :memo: Other files/folders from third parties (**OPTIONAL**) such as tox.ini
 
 :::note
 + **There can be cases where MVC folder structure as well as framework related folder structure can be used.** 
@@ -40,5 +52,6 @@ sidebar_label: Project Structure
 
 
 ### Project Template Generation Tool 
+* [Python Package Authority Sample](https://github.com/pypa/sampleproject) can be used as bootstrap.
 * Look into [cookiecutter](https://cookiecutter.readthedocs.io/en/1.7.2/) tool for template generation.
     - [List of templates for cookiecutter](http://cookiecutter-templates.sebastianruml.name/)