Update README.md

Author: gmlarumbe

README.md

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 Full SystemVerilog IEEE 1800-2023 grammar for [tree-sitter](https://github.com/tree-sitter/tree-sitter).
 
+# Differences with [tree-sitter-verilog](https://github.com/tree-sitter/tree-sitter-verilog)
+
+## Pros ##
+- Full implementation of the latest SystemVerilog standard (IEEE 1800-2023)
+- Robust and reliable
+- Actively maintained
+- Thoroughly tested (~2000 tests, including the whole UVM 2.0 and some open source projects)
+- Implements node fields
+- Supports parsing of code snippets (e.g., always block outside of a module)
+- Basic preprocessing capabilities
+- Currently used on Emacs `verilog-ts-mode` and `nvim systemverilog` plugin
+
+## Cons
+- Generated parser is double the size
+  - Generation of the compiled grammar takes longer (this only needs to be done once)
+
 ## References
 
 - https://en.wikipedia.org/wiki/Verilog