Add corrected Snapshot builds section pointing to Sonatype Central

Replace the removed GitHub Packages snapshot instructions with the
correct Sonatype Central snapshot repository. No credentials required.
Restore the snapshot badge linking to the Sonatype snapshot repo.

https://claude.ai/code/session_01TLazuhMKS5WrYpmUx7eM8s

Author: claude

README.md

@@ -1,6 +1,7 @@
 ![Java 8+](https://img.shields.io/badge/Java-8%2B-informational)
 [![llama.cpp b9106](https://img.shields.io/badge/llama.cpp-%23b9106-informational)](https://github.com/ggml-org/llama.cpp/releases/tag/b9106)
 [![Maven Central](https://img.shields.io/maven-central/v/net.ladenthin/llama)](https://central.sonatype.com/artifact/net.ladenthin/llama)
+[![Snapshot](https://img.shields.io/badge/snapshot-latest-informational)](https://central.sonatype.com/repository/maven-snapshots/net/ladenthin/llama/)
 
 # Java Bindings for [llama.cpp](https://github.com/ggerganov/llama.cpp)
 
@@ -46,6 +47,31 @@ Access this library via Maven (released versions on Maven Central):
 
 There are multiple [examples](src/test/java/examples).
 
+### Snapshot builds
+
+Every push to `main` publishes a snapshot to the [Sonatype Central snapshot repository](https://central.sonatype.com/repository/maven-snapshots/net/ladenthin/llama/).
+
+To use the latest snapshot, add the repository and dependency to your `pom.xml`:
+
+```xml
+<repositories>
+  <repository>
+    <id>sonatype-snapshots</id>
+    <url>https://central.sonatype.com/repository/maven-snapshots/</url>
+    <snapshots><enabled>true</enabled></snapshots>
+    <releases><enabled>false</enabled></releases>
+  </repository>
+</repositories>
+
+<dependency>
+    <groupId>net.ladenthin</groupId>
+    <artifactId>llama</artifactId>
+    <version>5.0.1-SNAPSHOT</version>
+</dependency>
+```
+
+No credentials are required — the repository is publicly readable.
+
 ### No Setup required
 
 We support CPU inference for the following platforms out of the box: