feat: Update readme to describe package use case

README.md

@@ -3,3 +3,65 @@
 A complete autogenerated set of Zig bindings for the Win32 API.
 
 These bindings are generated by https://github.com/marlersoft/zigwin32gen
+
+## Install / Update (v0.12.0)
+
+Re-run this command to overwrite and update hash to get latest updates
+
+```bash
+zig fetch --save https://github.com/marlersoft/zigwin32/archive/main.tar.gz
+```
+
+This will add an entry into `dependencies` in your `build.zig.zon` file like this:
+
+```zig
+.{
+    // ...
+    .dependencies = .{
+        .zigwin32 = .{
+            .url = "https://github.com/marlersoft/zigwin32/archive/main.tar.gz",
+            .hash = "<hash>"
+        }
+    }
+}
+```
+
+After the package is installed. The package/dependency can be referenced and added to the `build.zig` file to expose it to libraries and executables.
+
+```zig
+// build.zig
+// ...
+pub fn build(b: *std.Build) void {
+    // ...
+    const target = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
+
+    const zigwin32 = b.dependency("zigwin32", .{});
+
+    const your_module = b.addModule("your-module", .{
+        .root_source_file = b.path("src/root.zig"),
+    });
+
+    your_module.addImport("zigwin32", zigwin32.module("zigwin32"))
+
+    // or
+
+    const exe = b.addExecutable(.{
+        .name = "<your exe name>",
+        .root_source_file = b.path("main.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+
+    exe.root_module.addImport("zigwin32", zigwin32.module("zigwin32"))
+
+    // ...
+}
+```
+
+Now the dependency is fully imported and can be used
+
+```zig
+// any-file.zig
+const zigwin32 = @import("zigwin32");
+```