Add LICENSE, AGENTS.md, and richer package metadata

AGENTS.md

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+# AGENTS.md — uapi-sdk-go
+
+This file tells AI coding agents how to use the **official Go SDK** for the
+[uapis.cn](https://uapis.cn) public API platform.
+
+## What this package is
+
+Idiomatic Go client for UAPI. Generated from the live OpenAPI 3.1 spec at
+<https://uapis.cn/openapi.json>, so the method list, parameter shapes, and
+return types stay in lock-step with the real API.
+
+```bash
+go get github.com/AxT-Team/uapi-sdk-go@latest
+```
+
+## Quick start
+
+```go
+package main
+
+import (
+    "context"
+    "fmt"
+    "log"
+
+    "github.com/AxT-Team/uapi-sdk-go/uapi"
+)
+
+func main() {
+    ctx := context.Background()
+
+    // Free-tier endpoints don't need an API key
+    client := uapi.NewClient("https://uapis.cn")
+    weather, err := client.Misc.GetMiscWeather(ctx, &uapi.GetMiscWeatherRequest{
+        City: "北京",
+    })
+    if err != nil {
+        log.Fatal(err)
+    }
+    fmt.Printf("%+v\n", weather)
+}
+```
+
+The client is grouped by tag (`Misc`, `Network`, `Text`, `Image`, `Social`,
+`Translate`, `Search`, …). Method names match the OpenAPI `operationId`.
+
+## Authentication
+
+Free-tier endpoints work with no key. Paid endpoints take a key:
+
+```go
+client := uapi.NewClient("https://uapis.cn", uapi.WithAPIKey("sk_…"))
+```
+
+## Errors
+
+Every method returns `(response, error)`. On non-2xx, `error` is a
+`*uapi.APIError` with `Code`, `Success`, `Error`, and `RequestID`. Surface
+`err.Error` verbatim; do not retry on `400` or `401`.
+
+## Rate limits
+
+Headers `X-RateLimit-Limit`, `X-RateLimit-Remaining`, `X-RateLimit-Reset`,
+`Retry-After` are exposed via `uapi.RateLimitFrom(resp)`. Honor them — back
+off on `429` and obey `Retry-After`.
+
+## Discovery
+
+For unknown endpoints, fetch <https://uapis.cn/openapi.json>. The
+`operationId` maps directly to a Go method (`get-misc-weather` →
+`client.Misc.GetMiscWeather`).
+
+## Related repos
+
+- MCP server: <https://github.com/AxT-Team/uapi-mcp> — same endpoints as MCP tools.
+- Skills bundle: <https://github.com/AxT-Team/uapi-agent-skills>.
+- Other languages: `uapi-sdk-typescript`, `uapi-sdk-python`, `uapi-sdk-rust`,
+  `uapi-sdk-java`, `uapi-sdk-csharp`, `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.