docs: add standardized README

README.md

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+# <p align="center"><img src="./img/pg_logo.svg" height="128px" alt="PostGuard" /></p>
+
+> For full documentation, visit [docs.postguard.eu](https://docs.postguard.eu).
+
+Example applications demonstrating PostGuard integration. Contains reference implementations for developers building on PostGuard. Code snippets in docs.postguard.eu come from this repo.
+
+There are two sub-projects:
+
+- **pg-sveltekit/** -- SvelteKit web app using the `@e4a/pg-js` SDK.
+- **pg-dotnet/** -- .NET console app using the `postguard-dotnet` SDK.
+
+## Development
+
+### SvelteKit example
+
+```bash
+cd pg-sveltekit
+npm install
+npm run dev
+```
+
+### .NET example
+
+Requires .NET 8.0+ SDK, a Rust toolchain, and a PostGuard API key.
+
+```bash
+cd pg-dotnet
+dotnet run
+```
+
+See [pg-dotnet/README.md](pg-dotnet/README.md) for full setup instructions including how to build the native library and configure your API key.
+
+## Releasing
+
+No releases. This is example code.
+
+## License
+
+MIT