Add ESI.NET to community resources

docs/community/esi-net/index.md

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+search:
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+title: ESI.NET
+type: resource
+description: A .NET client for EVE Online's ESI API with SSO/PKCE auth, transparent token refresh, and full endpoint coverage.
+maintainer:
+  name: Psianna Archeia
+  github: seraphx2
+---
+
+# ESI.NET
+
+A .NET wrapper for EVE Online's ESI API, multi-targeting `netstandard2.0`, `net8.0`, and `net10.0`. Handles the SSO/OAuth2 flow (including PKCE), transparently refreshes near-expired access tokens before a request goes out, and wraps every ESI endpoint behind a typed client registered via `IHttpClientFactory`.
+
+<div class="grid cards" markdown>
+
+- [:octicons-mark-github-16: __GitHub__](https://github.com/seraphx2/ESI.NET){ .esi-card-link }
+- [:simple-nuget: __NuGet__](https://www.nuget.org/packages/ESI.NET){ .esi-card-link }
+- [:simple-discord: __Discord__](https://discord.gg/SvdN39f){ .esi-card-link }
+
+</div>
+
+## Features
+
+- Every ESI endpoint wrapped behind a typed `IEsiClient`, organized by category (`client.Character`, `client.Assets`, `client.Universe`, ...)
+- SSO/OAuth2 authentication, including the PKCE flow for public (secretless) clients
+- Transparent access-token refresh - a near-expired token is refreshed automatically before an authenticated call goes out, with a DI-friendly hook to persist the rotated refresh token
+- Per-call options for cancellation, conditional requests (`ETag`/`If-None-Match`), and pagination
+- Actively monitored against CCP's live API every day, so new endpoints and spec changes get caught - and shipped - fast, not months later