Add a glossary, list of acronyms and/or list of symbols

At some point we might add a glossary, list of acronyms and/or list of symbols, which I already wrote for the LaTeX version of the VHDL LRM: [Glossary.txt](https://github.com/hdl/awesome/files/5858127/Glossary.txt)

_Originally posted by @umarcor in https://github.com/hdl/awesome/pull/72#discussion_r562860464_