add fluent templates example

templating/fluent/README.md

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+# Fluent Templates
+
+This is an example of how to integrate [Fluent Templates](https://crates.io/crates/fluent-templates) with Actix Web using the Handlebars templating engine.
+
+# Directory Structure
+
+- `src`: Rust source code for web server and endpoint configuration
+- `templates`: Handlebars templates (no text content is stored in the templates)
+- `locales`: Fluent files containing translations for English (en) and French (fr)
+
+## Usage
+
+```sh
+cd templating/fluent
+cargo run
+```
+
+After starting the server, you may visit the following pages:
+
+- http://localhost:8080
+- http://localhost:8080/Alice/documents
+- http://localhost:8080/Bob/passwords
+- http://localhost:8080/some-non-existing-page - 404 error rendered using template
+
+This example implements language selection using the standard Accept-Language header, which is sent by browsers according to OS/browser settings. To view the translated pages, pass the Accept-Encoding header with `en` or `fr`. Values which do not have associated translation files will fall back to English.
+
+```
+# using HTTPie
+http :8080/Alice/documents Accept-Language:fr
+
+# using cURL
+curl http://localhost:8080/Alice/documents -H 'accept-language: fr'
+```