Add ESI OpenAPI community resource

docs/community/esi-openapi/index.md

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+---
+search:
+  exclude: true
+
+title: ESI OpenAPI
+type: resource
+description: Rust client library for ESI based on the OpenAPI 3.1 spec, with pagination, caching, bulk requests and rate limiting.
+maintainer:
+  name: rafaga
+  github: rafaga
+---
+
+# ESI OpenAPI
+
+A Rust client library for EVE Online's ESI. It is a fork of [rfesi](https://github.com/Celeo/rfesi) (from 0.50.2) that moves from ESI's retired Swagger 2.0 spec to the OpenAPI 3.1 spec. Migrating from rfesi mostly means replacing `use rfesi::` with `use esi_openapi::`.
+
+<div class="grid cards" markdown>
+
+- [:octicons-mark-github-16: __GitHub__](https://github.com/rafaga/esi-openapi){ .esi-card-link }
+- [:octicons-package-16: __crates.io__](https://crates.io/crates/esi-openapi){ .esi-card-link }
+- [:octicons-book-16: __docs.rs__](https://docs.rs/esi-openapi){ .esi-card-link }
+
+</div>
+
+## Features
+
+- Covers all 233 operations in the ESI OpenAPI spec (compatibility date 2026-08-18) through endpoint groups (`Esi::group_*()`), checked by a conformance test.
+- Pagination helpers, including access to the `X-Pages` count.
+- Optional response cache that revalidates with `ETag`/`Last-Modified` and honors `x-client-cache-ttl`.
+- Automatic splitting of bulk requests that exceed the spec's maximum list size.
+- Optional rate-limit policy that waits or fails instead of triggering `429` errors (off by default).
+- Sends the `X-Compatibility-Date` header and handles `X-Ratelimit-*` and `Retry-After`.
+- Reads scopes, roles and rate limits declared per operation, and reloads the spec only when stale.
+- Language and tenant settings, and a dedicated error for resources ESI has tombstoned.
+- Operations not yet wrapped can be called with `Esi::get_endpoint_for_op_id` and `Esi::query`.
+
+## Usage
+
+```sh
+cargo add esi-openapi
+```
+
+The `random_state`, `validate_jwt` and `rustls-tls` features are enabled by default; disable the first two if you don't need them. See the [documentation on docs.rs](https://docs.rs/esi-openapi) for the API, and the repository's `CHANGELOG.md` for the mapping from rfesi's operation IDs.
+
+## License
+
+Dual-licensed under Apache-2.0 or MIT, at your option. The original rfesi copyright notices are retained.