Add Boost guidelines for Octane dependency injection (#1099)

* Add Boost guidelines for Octane dependency injection

* Update core.blade.php

---------

Co-authored-by: Taylor Otwell <taylor@laravel.com>

Author: pushpak1300

resources/boost/guidelines/core.blade.php

@@ -0,0 +1,15 @@
+# Octane
+
+- Octane boots the application once and reuses it across requests, so singletons persist between requests.
+- The Laravel container's `scoped` method may be used as a safe alternative to `singleton`.
+- Never inject the container, request, or config repository into a singleton's constructor; use a resolver closure or `bind()` instead:
+
+```php
+// Bad
+$this->app->singleton(Service::class, fn (Application $app) => new Service($app['request']));
+
+// Good
+$this->app->singleton(Service::class, fn () => new Service(fn () => request()));
+```
+
+- Never append to static properties, as they accumulate in memory across requests.