combine docs into zoitechat repo

docs/README.md

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+# ZoiteChat documentation
+
+## Getting started
+
+* Install [Python 3](https://www.python.org/)
+* Install pip for Python 3
+* Install Sphinx: `python -m pip install sphinx`
+* On Windows: ensure your Python 3 installation is on `PATH`
+* Run `make html` to build the HTML files
+* Run the Python webserver to test your changes: `make server`
+  (http://localhost:8000/)
+
+
+## Conventions
+
+* 4 Spaces are used for indentation.
+* Ordered or unordered lists use visual indentation, where any non-list
+  subelement would use an indentation of a multiple of 4 again.
+
+Example:
+
+```rest
+- a list item
+- a list item
+  with a visually indented continuation
+- a list item with a sub-list
+  
+  - that is also visually indented
+- a list item with a code block
+
+    .. code-block:: none
+
+        that is not visually indented
+```
+
+## Read the Docs theme skin
+
+The HTML output keeps the existing `basicstrap` Sphinx theme, then applies the
+ZoiteChat main-site skin from `_static/css/zoitechat-docs.css`.
+
+Brand navigation links are set in `conf.py` through `html_context`, and the
+header logo uses `_static/zoitechat-logo.svg`.