Create README.md

README.md

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+# Squidex Java Library
+
+[![Maven Central](https://img.shields.io/maven-central/v/io.squidex/squidex)](https://central.sonatype.com/artifact/io.squidex/squidex) 
+[![fern shield](https://img.shields.io/badge/%F0%9F%8C%BF-SDK%20generated%20by%20Fern-brightgreen)](https://github.com/fern-api/fern)
+
+The Squidex Java SDK provides convenient access to the Squidex API from Java. 
+
+## Documentation
+
+API reference documentation is available [here](https://cloud.squidex.io/api/docs).
+
+## Installation
+
+### Gradle
+
+Add the dependency in your `build.gradle`:
+
+```groovy
+dependencies {
+    implementation 'io.squidex:squidex:0.x.x'
+}
+```
+
+### Maven
+
+Add the dependency in your `pom.xml`:
+
+```xml
+<dependency>
+    <groupId>io.squidex</groupId>
+    <artifactId>squidex</artifactId>
+    <version>0.x.x</version>
+</dependency>
+```
+
+## Usage
+
+```java
+SquidexApiClient squidex = SquidexApiClient.builder()
+    .token("YOUR_OAUTH_TOKEN")
+    .url("https://your.squidex-deployment")
+    .appName("my-app")
+    .build();
+
+RulesDto rules = squidex.rules().getRules();
+
+System.out.println("Received response from Squidex: " + rules);
+```
+
+## Staged Builders
+The generated builders all follow the staged builder pattern. Read more [here](https://immutables.github.io/immutable.html#staged-builder). 
+Staged builders only allow you to build the object once all required properties have been specified. 
+
+## Beta status
+
+This SDK is in beta, and there may be breaking changes between versions without a major version update. 
+Therefore, we recommend pinning the package version to a specific version in your build.gradle file. 
+This way, you can install the same version each time without breaking changes unless you are intentionally 
+looking for the latest version.
+
+## Contributing
+
+While we value open-source contributions to this SDK, this library is generated programmatically.
+Additions made directly to this library would have to be moved over to our generation code, otherwise 
+they would be overwritten upon the next generated release. Feel free to open a PR as a proof of concept, 
+but know that we will not be able to merge it as-is. We suggest opening an issue first to discuss with us!
+
+On the other hand, contributions to the README are always very welcome!