chore(build): add more documentation

Author: playday3008

build.zig

@@ -34,7 +34,15 @@ pub fn build(b: *std.Build) void {
     // multiple modules and consumers will need to be able to specify which
     // module they want to access.
     const mod = b.addModule("ScriptHookZig", .{
+        // The root source file is the "entry point" of this module. Users of
+        // this module will only be able to access public declarations contained
+        // in this file, which means that if you have declarations that you
+        // intend to expose to consumers that were defined in other files part
+        // of this module, you will have to make sure to re-export them from
+        // the root file.
         .root_source_file = b.path("src/root.zig"),
+        // Later on we'll use this module as the root module of a test executable
+        // which requires us to specify a target.
         .target = target,
         .optimize = optimize,
         .pic = true,