Update README

README.md

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-# tree-sitter-sql
+# tree-sitter-sql
+
+[![Build/test]()]()
+
+SQL grammar for [tree-sitter](https://github.com/tree-sitter/tree-sitter).
+
+## Features
+
+- [x] SELECT statements (some features may be incomplete)
+- [x] Index hints
+- [x] Comments 
+- [x] Marginalia 
+- [ ] UPDATE statements
+- [ ] DELETE statements
+- [ ] CREATE statements
+- [ ] DROP statements
+- [ ] ALTER TABLE statements
+- [ ] CREATE INDEX statements
+- [ ] DROP INDEX statements
+- [ ] ALTER INDEX statements
+- [ ] EXPLAIN statements
+- [ ] Functions (some are implemented)
+
+For a complete list of features see the the [tests](test/corpus)
+
+## References
+
+* [The ESTree Spec](https://en.wikipedia.org/wiki/SQL_syntax#Operators) - I consulted wikipedia for naming conventions,
+  though I may not have been strict early on in the prototyping.
+* [Phoenix Language Reference](https://forcedotcom.github.io/phoenix/index.html) - Note I'm using this as a reference
+  but implementing the Grammar in terms of the MySQL dialect of SQL.