Add LICENSE, AGENTS.md, and richer package metadata

AGENTS.md

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+# AGENTS.md — uapi-sdk-java
+
+This file tells AI coding agents how to use the **official Java SDK** for
+the [uapis.cn](https://uapis.cn) public API platform.
+
+## What this artifact is
+
+Idiomatic Java client for UAPI. Generated from the live OpenAPI 3.1 spec at
+<https://uapis.cn/openapi.json> — class names, method names, and parameter
+shapes track the real API.
+
+## Install
+
+Maven (`pom.xml`):
+
+```xml
+<dependency>
+  <groupId>cn.uapis</groupId>
+  <artifactId>uapi-sdk-java</artifactId>
+  <version>0.1.17</version>
+</dependency>
+```
+
+Gradle (`build.gradle.kts`):
+
+```kotlin
+implementation("cn.uapis:uapi-sdk-java:0.1.17")
+```
+
+## Quick start
+
+```java
+import cn.uapis.UapiClient;
+import cn.uapis.api.MiscApi;
+import cn.uapis.model.GetMiscWeatherRequest;
+
+UapiClient client = new UapiClient("https://uapis.cn");
+MiscApi misc = new MiscApi(client);
+var resp = misc.getMiscWeather(new GetMiscWeatherRequest().city("北京"));
+System.out.println(resp);
+```
+
+The SDK is grouped by tag (`MiscApi`, `NetworkApi`, `TextApi`, `ImageApi`,
+`SocialApi`, `TranslateApi`, `SearchApi`, …). Method names match the
+OpenAPI `operationId`, camelCased.
+
+## Authentication
+
+Free-tier endpoints work with no key. Paid endpoints take a key:
+
+```java
+UapiClient client = new UapiClient("https://uapis.cn", "sk_…");
+```
+
+## Errors
+
+Methods throw `UapiApiException` (subclass of `IOException`) on non-2xx
+responses. The exception carries `code`, `error`, and `requestId` fields.
+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-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.

pom.xml

@@ -8,6 +8,29 @@
     <maven.compiler.target>17</maven.compiler.target>
     <maven.compiler.source>17</maven.compiler.source>
   </properties>
+  <name>UAPI SDK for Java</name>
+  <description>Official Java SDK for UAPI / uapis.cn — typed Java 17+ wrapper around 100+ free public-API endpoints (network, text, image, social, translation, search). Generated from the live OpenAPI 3.1 spec.</description>
+  <url>https://uapis.cn/docs/sdk/java</url>
+  <licenses>
+    <license>
+      <name>MIT License</name>
+      <url>https://github.com/AxT-Team/uapi-sdk-java/blob/main/LICENSE</url>
+    </license>
+  </licenses>
+  <developers>
+    <developer>
+      <id>uapi</id>
+      <name>UAPI</name>
+      <email>dev@uapis.cn</email>
+      <organization>AxT-Team</organization>
+      <organizationUrl>https://uapis.cn</organizationUrl>
+    </developer>
+  </developers>
+  <scm>
+    <connection>scm:git:git://github.com/AxT-Team/uapi-sdk-java.git</connection>
+    <developerConnection>scm:git:ssh://github.com:AxT-Team/uapi-sdk-java.git</developerConnection>
+    <url>https://github.com/AxT-Team/uapi-sdk-java/tree/main</url>
+  </scm>
   <dependencies>
     <dependency>
       <groupId>com.squareup.okhttp3</groupId>