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.yml

@@ -0,0 +1,18 @@
+site_name: MkDocs semiliterate plugin
+nav:
+- Overview: README.md
+- Usage: mkdocs_semiliterate/plugin.md
+plugins:
+- search
+- semiliterate:
+    merge_docs_dir: false
+    ignore_folders: [dist]
+    include_extensions: [LICENSE]
+#    semiliterate:
+#      - pattern: '(\.md)$'
+#        replace: [['^(.*)<!-- repo: -->.*<!-- site:(.*?) -->(.*\s*)$', '\1\2\3']]
+markdown_extensions:
+- abbr
+theme:
+  name: readthedocs
+docs_dir: mkdocs_semiliterate # dummy