Add README.md

Author: gmlarumbe

README.md

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+[![CI](https://github.com/gmlarumbe/tree-sitter-systemverilog/actions/workflows/ci.yml/badge.svg)](https://github.com/gmlarumbe/tree-sitter-systemverilog/actions/workflows/ci.yml)
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+# tree-sitter-systemverilog
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+Full SystemVerilog IEEE 1800-2023 grammar for [tree-sitter](https://github.com/tree-sitter/tree-sitter).
+
+## References
+
+- https://en.wikipedia.org/wiki/Verilog
+- http://tree-sitter.github.io/tree-sitter/creating-parsers
+