Add simple README.md describing how to use Bison to generate the ILAS…

…M parser
dotnet · May 14, 2024 · 5e07c63 · 5e07c63
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+# Generating the Parser using Bison
+
+- Bison for Windows: https://github.com/lexxmark/winflexbison
+- Other platforms: https://www.gnu.org/software/bison
+
+To generate `asmparse.cpp`, run either of following:
+- Unix: `yacc asmparse.y -o asmparse.cpp`
+- Windows: `win_bison asmparse.y -o asmparse.cpp`
+