Added README

README.md

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+# Kwil Header tool
+An in-development command line tool for generating serialization code from C header files.
+
+Features:
+[x] Generate `*_json_length` and `*_to_json`functions for structs and enums marked with `KWIL_STRUCT()` or `KWIL_ENUM()`
+[ ] Generate `*_from_json` functins for structs.
+[ ] Dynamic array length specifiers (e.g: `KWIL_FIELD(LEN=13` or `KWIL_FIELD(LEN=<field_name>`)
+
+## Example
+```c
+#include "kwil.h" // kwil.h header contains empty KWIL_STRUCT() KWIL_ENUM() and KWIL_FIELD() macros
+
+```