Add README.md to //lisp

I sometimes forget the purpose of this project, so -- while it is fresh
in my mind -- I'm documenting it in a README.

lisp/README.md

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+# Common Lisp
+
+Things that I like about Common Lisp:
+- It's an S-expression based language.
+- It has a powerful macro system
+- It has a unique way of handling-errors
+- It is highly introspectible
+- The tooling integration with Emacs is the best I have ever seen for any language
+
+Things that I don't like about Common Lisp:
+- I find its standard libraries difficult to use and -- compared to modern
+  libraries -- like Golang's or Elixir's standard libraries, Common Lisp's
+  libraries are clunky
+
+As such, I would like to modernize CL's libraries to resemble other libraries
+with which I am more familiar and, therefore, productive.