Initial commit of documentation System (#66)

Add documentation and its build environment.

.gitignore

@@ -1,3 +1,6 @@
 # ignore files created during build
 build/
 src/cocotb_bus.egg-info/
+*.vcd
+*.xml
+sim_build

.readthedocs.yml

@@ -0,0 +1,34 @@
+# .readthedocs.yaml
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+# Set the OS, Python version and other tools you might need
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.12"
+    # You can also specify other tool versions:
+    # nodejs: "19"
+    # rust: "1.64"
+    # golang: "1.19"
+
+# Build documentation in the "docs/" directory with Sphinx
+sphinx:
+   configuration: docs/source/conf.py
+
+# Optionally build your docs in additional formats such as PDF and ePub
+# formats:
+#    - pdf
+#    - epub
+
+# Optional but recommended, declare the Python requirements required
+# to build your documentation
+# See https://docs.readthedocs.io/en/stable/guides/reproducible-builds.html
+python:
+   install:
+   - requirements: docs/requirements.txt
+   - method: pip
+     path: . 

docs/requirements.txt

@@ -0,0 +1,13 @@
+# Python dependencies to build the documentation
+
+Sphinx ~= 7.0
+sphinx-rtd-theme >= 1.3.0
+sphinxcontrib-svg2pdfconverter[CairoSVG]
+sphinxcontrib-spelling >= 5.3.0
+pyenchant
+sphinx-issues
+sphinx-argparse-cli
+towncrier
+sphinx-tabs
+sphinxcontrib-details-directive
+looseversion