Add LICENSE, AGENTS.md, and richer package metadata

AGENTS.md

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+# AGENTS.md — uapi-sdk-csharp
+
+This file tells AI coding agents how to use the **official .NET / C# SDK**
+for the [uapis.cn](https://uapis.cn) public API platform.
+
+## What this package is
+
+Idiomatic .NET client for UAPI, targeting `net8.0`. Generated from the live
+OpenAPI 3.1 spec at <https://uapis.cn/openapi.json>.
+
+## Install
+
+```bash
+dotnet add package Uapi.Sdk
+```
+
+## Quick start
+
+```csharp
+using Uapi.Sdk;
+
+var client = new UapiClient("https://uapis.cn");
+var weather = await client.Misc.GetMiscWeatherAsync(new GetMiscWeatherRequest
+{
+    City = "北京"
+});
+Console.WriteLine(weather);
+```
+
+The client is grouped by tag (`Misc`, `Network`, `Text`, `Image`, `Social`,
+`Translate`, `Search`, …). Method names match the OpenAPI `operationId`,
+PascalCased and suffixed with `Async`.
+
+## Authentication
+
+Free-tier endpoints work with no key. Paid endpoints take a key:
+
+```csharp
+var client = new UapiClient("https://uapis.cn", apiKey: "sk_…");
+```
+
+## Errors
+
+Methods throw `UapiApiException` on non-2xx responses. The exception
+carries `Code`, `Error`, and `RequestId` properties. Surface `Error`
+verbatim.
+
+## Rate limits
+
+Headers `X-RateLimit-Limit`, `X-RateLimit-Remaining`, `X-RateLimit-Reset`,
+`Retry-After` are exposed on response headers. Honor them.
+
+## Related repos
+
+- MCP server: <https://github.com/AxT-Team/uapi-mcp>.
+- Skills bundle: <https://github.com/AxT-Team/uapi-agent-skills>.
+- Other languages: `uapi-sdk-typescript`, `uapi-sdk-python`, `uapi-sdk-go`,
+  `uapi-sdk-rust`, `uapi-sdk-java`, `uapi-sdk-cpp`, `uapi-sdk-php`.

LICENSE

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+MIT License
+
+Copyright (c) 2025 AxT-Team / UAPI
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

uapi-sdk-csharp.csproj

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     <Nullable>enable</Nullable>
     <EnableDefaultCompileItems>false</EnableDefaultCompileItems>
     <Version>1.0.5</Version>
+    <PackageId>Uapi.Sdk</PackageId>
+    <Authors>UAPI / AxT-Team</Authors>
+    <Company>UAPI</Company>
+    <Description>Official .NET / C# SDK for UAPI / uapis.cn — typed .NET 8 wrapper around 100+ free public-API endpoints (network, text, image, social, translation, search). Generated from the live OpenAPI 3.1 spec.</Description>
+    <PackageTags>uapi;uapis;sdk;dotnet;public-api;free-api;openapi;rest;client;agent;llm</PackageTags>
+    <PackageProjectUrl>https://uapis.cn/docs/sdk/csharp</PackageProjectUrl>
+    <RepositoryUrl>https://github.com/AxT-Team/uapi-sdk-csharp</RepositoryUrl>
+    <RepositoryType>git</RepositoryType>
+    <PackageLicenseExpression>MIT</PackageLicenseExpression>
+    <PackageReadmeFile>README.md</PackageReadmeFile>
+    <PackageIcon>banner.png</PackageIcon>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="src/**/*.cs" />
+    <None Include="README.md" Pack="true" PackagePath="\" />
+    <None Include="banner.png" Pack="true" PackagePath="\" />
   </ItemGroup>
 </Project>