docs: add infrastructure taken from the Vunit main project

Author: rodrigomelo9

.gitignore

@@ -1,2 +1,5 @@
 __pycache__/
 vunit_out/
+/docs/_build
+/docs/_theme
+*.tgz

docs/_static/VUnit_logo_175x175.png

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+# -*- coding: utf-8 -*-
+
+import os
+import sys
+from pathlib import Path
+
+# -- Sphinx Options -----------------------------------------------------------
+
+# If your project needs a minimal Sphinx version, state it here.
+needs_sphinx = "3.0"
+
+extensions = [
+    "sphinx.ext.extlinks",
+    "sphinx.ext.intersphinx",
+    "sphinx.ext.todo",
+    "sphinxarg.ext",  # Automatic argparse command line argument documentation
+]
+
+# The suffix(es) of source filenames.
+source_suffix = {
+    ".rst": "restructuredtext"
+}
+
+master_doc = "index"
+
+project = u"Introduction to TDD and CI With VUnit"
+copyright = u"2014-2021, Lars Asplund"
+author = u"LarsAsplund and contributors"
+
+version = ""
+release = ""
+
+language = None
+
+exclude_patterns = []
+
+pygments_style = "sphinx"
+
+todo_include_todos = False
+
+# -- Options for HTML output ----------------------------------------------
+
+html_theme_path = ["."]
+html_theme = "_theme"
+
+html_theme_options = {
+    "analytics_id": "UA-abcdefghi-j",
+    "logo_only": True,
+    "vcs_pageview_mode": "blob",
+    "style_nav_header_background": "#0c479d",
+    "home_breadcrumbs": False,
+}
+html_context = {
+    "conf_py_path": "%s/" % Path(__file__).parent.name,
+    "display_github": True,
+    "github_user": "VUnit",
+    "github_repo": "vunit",
+    "github_version": "master/",
+}
+
+html_static_path = ["_static"]
+
+html_logo = str(Path(html_static_path[0]) / "VUnit_logo_175x175.png")
+
+html_favicon = str(Path(html_static_path[0]) / "vunit.ico")
+
+# Output file base name for HTML help builder.
+htmlhelp_basename = "VUnitDoc"
+
+# -- InterSphinx ----------------------------------------------------------
+
+intersphinx_mapping = {
+    "ghdl": ("https://ghdl.github.io/ghdl", None),
+    "python": ("https://docs.python.org/3.8/", None),
+    "vunit": ("https://vunit.github.io", None),
+}
+
+# -- ExtLinks -------------------------------------------------------------
+
+extlinks = {
+    "vunit_example": ("https://github.com/VUnit/vunit/tree/master/examples/%s/", ""),
+    "vunit_file": ("https://github.com/VUnit/vunit/tree/master/%s/", ""),
+    "vunit_commit": ("https://github.com/vunit/vunit/tree/%s/", "@"),
+    "vunit_issue": ("https://github.com/VUnit/vunit/issues/%s/", "#"),
+}

docs/_static/vunit.ico

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+
+.. centered:: |shieldRepo|_ |shieldGitter|_ |shieldTwitter|_
+
+.. |shieldRepo| image:: https://img.shields.io/badge/VUnit/vunit-0c479d.svg?longCache=true&style=flat-square&logo=github
+.. _shieldRepo: https://github.com/VUnit/tdd-intro
+
+.. |shieldGitter| image:: https://img.shields.io/gitter/room/VUnit/vunit.svg?longCache=true&style=flat-square&logo=gitter&logoColor=4db797&color=4db797
+.. _shieldGitter: https://gitter.im/VUnit/vunit
+
+.. |shieldTwitter| image:: https://img.shields.io/twitter/follow/VUnitFramework.svg?longCache=true&style=flat-square&color=1DA1F2&label=%40VUnitFramework&logo=twitter&logoColor=fff
+.. _shieldTwitter: https://www.twitter.com/VUnitFramework
+
+Introduction to Test-Driven Development and Continuous Integration With VUnit
+=============================================================================
+
+.. toctree::
+   :caption: Tutorial
+   :hidden: