readme: separate readmes

Logic/readme.md

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+things that are in here:
+
+## general things
+
+### [Logic/Parse.hs](Logic/Parse.hs)
+
+- generic sequence parser
+
+### [Logic/Graph.hs](Logic/Graph.hs)
+
+- generic breadth-first search
+
+## statement things
+
+### [Logic/Statement/Parse.hs](Logic/Statement/Serialize.hs)
+
+- parse string -> statement
+- serialize a statement -> plaintext, LaTeX
+
+### [Logic/Language/Impl/L.hs](Logic/Language/Impl/L.hs)
+
+- serialize a statement -> L (the formal language)
+- parse L (the formal language) string -> statement
+
+## semantic statement things
+
+### [Logic/Statement/Eval.hs](Logic/Statement/Eval.hs)
+
+- assign truth values and evaluate statements
+- determine tautology, contradiction, or contingent
+
+### [Logic/Statement/Serialize.hs](Logic/Statement/Serialize.hs)
+
+- generate a LaTeX truth table from a statement
+
+### [Logic/Statements/Laws.hs](Logic/Statements/Laws.hs)
+
+- match/replace patterns in statements (e.g. logical laws)
+- verify logical-law equivalence of statements (TODO)
+- find logical-law equivalence of statements with breadth-first search (slow)
+
+## syntactic things
+
+### [Logic/Language.hs](Logic/Language.hs)
+
+- implement formal languages (symbols, axioms schemas, and inference rules)
+  with a clunky api, see also
+  <https://en.wikipedia.org/wiki/Post_canonical_system>
+
+### [Logic/Language/Derivation.hs](Logic/Language/Derivation.hs)
+
+- verify derivations in formal languages
+
+### formal languages
+
+- [the MIU system](Logic/Language/Impl/MIU.hs) (from "Gödel, Escher, Bach")
+- [L](Logic/Language/Impl/L.hs)