chore: initialize setuptools project

Also provides semiliterate plugin stub, lays out basic initial documentation
  for the project, and adds a simple mkdocs.yml file that builds a rudimentary
  documentation site.

mkdocs_semiliterate/plugin.py

@@ -0,0 +1,19 @@
+""" md
+## Usage
+
+Once this plugin is [installed](../README.md#installation), in your `mkdocs.yml`
+file just replace the plugin name `simple` with `semiliterate`. It accepts all
+of the same parameters as `simple`, so `mkdocs` will still work as before, and
+you will have immediate access to all of the following extensions:
+
+### Inclusion syntax
+
+To be documented when implemented.
+"""
+
+import mkdocs
+from mkdocs.config import config_options
+from mkdocs_simple_plugin.plugin import SimplePlugin
+
+class SemiliteratePlugin(SimplePlugin):
+    """ So far, just an alias for simple """