flesh out README

README.md

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+Mirah REPL
+========
+A REPL for Mirah
+
+# Features / Problems
+
+ - parses Mirah code, runs it, prints results out
+
+# Is it any good?
+
+Not yet, but I'm hopeful
+
+# TODOs
+
+* package it up--bin dir, gem-ify, etc
+* print the value of evaluated expressions (the P in REPL)
+* add a global binding
+* newast support
+
+## more experiments than TODOs
+* reach into PEG parser to do partial parsing
+* convert to Mirah source
+* use readline, or an equivalent
+* make it embeddable
+
+
+