Add requirements for docs

docs/requirements.in

@@ -0,0 +1,3 @@
+mkdocs
+mkdocstrings[python]
+markdown-include

docs/requirements.txt

@@ -0,0 +1,64 @@
+#
+# This file is autogenerated by pip-compile with python 3.10
+# To update, run:
+#
+#    pip-compile docs/requirements.in
+#
+click==8.1.3
+    # via mkdocs
+colorama==0.4.6
+    # via griffe
+ghp-import==2.1.0
+    # via mkdocs
+griffe==0.24.1
+    # via mkdocstrings-python
+jinja2==3.1.2
+    # via
+    #   mkdocs
+    #   mkdocstrings
+markdown==3.3.7
+    # via
+    #   markdown-include
+    #   mkdocs
+    #   mkdocs-autorefs
+    #   mkdocstrings
+    #   pymdown-extensions
+markdown-include==0.8.0
+    # via -r docs/requirements.in
+markupsafe==2.1.1
+    # via
+    #   jinja2
+    #   mkdocstrings
+mergedeep==1.3.4
+    # via mkdocs
+mkdocs==1.4.2
+    # via
+    #   -r docs/requirements.in
+    #   mkdocs-autorefs
+    #   mkdocstrings
+mkdocs-autorefs==0.4.1
+    # via mkdocstrings
+mkdocstrings[python]==0.19.0
+    # via
+    #   -r docs/requirements.in
+    #   mkdocstrings-python
+mkdocstrings-python==0.8.2
+    # via mkdocstrings
+packaging==21.3
+    # via mkdocs
+pymdown-extensions==9.9
+    # via mkdocstrings
+pyparsing==3.0.9
+    # via packaging
+python-dateutil==2.8.2
+    # via ghp-import
+pyyaml==6.0
+    # via
+    #   mkdocs
+    #   pyyaml-env-tag
+pyyaml-env-tag==0.1
+    # via mkdocs
+six==1.16.0
+    # via python-dateutil
+watchdog==2.1.9
+    # via mkdocs