add docs/requirements.txt for mkdocs config

Author: amorison

docs/requirements.txt

@@ -0,0 +1,7 @@
+mkdocs~=1.5.3
+mkdocs-gen-files~=0.5.0
+mkdocs-include-markdown-plugin~=6.0.5
+mkdocs-literate-nav~=0.6.1
+mkdocs-material~=9.5.17
+mkdocstrings[python]~=0.24.3
+black~=24.3