Initial framework for SD-Core Docs

Change-Id: I441247158203b718d9ed5e53c1aefc812139fd6e
diff --git a/requirements.txt b/requirements.txt
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+Sphinx~=4.1.2
+doc8~=0.9.0
+reuse~=0.13.0
+docutils==0.16
+sphinx-rtd-theme~=0.5.2
+sphinxcontrib-spelling~=7.2.1
+sphinx-multiversion~=0.2.4