Add clap dependency

Will be used for argument parsing

build.zig

@@ -83,6 +83,9 @@ pub fn build(b: *std.Build) void {
         }),
     });
 
+    const clap = b.dependency("clap", .{});
+    exe.root_module.addImport("clap", clap.module("clap"));
+
     // This declares intent for the executable to be installed into the
     // install prefix when running `zig build` (i.e. when executing the default
     // step). By default the install prefix is `zig-out/` but can be overridden