add: README, LICENSE and initial project structure

src/parser.zig

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+pub const lexer = @import("lexer.zig");

src/root.zig

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+///! Parser for nf file contents. This library provides a lexer and parser and
+///! emits an AST of valid nf file contents. In case of invalid files,
+///! corresponding errors are returned. For detailed error messages refer to
+///! `errorMessage()`
+pub const ast = @import("ast.zig");
+pub const parser = @import("parser.zig");