Add snapshot repository setup for Java Feature Flags SDK

[Copilot]

The Java Feature Flags SDK is in beta with a -SNAPSHOT version, but the documentation didn't explain how to configure build tools to pull snapshot dependencies from Sonatype's snapshot repository.

Changes

• Added "Installing the SDK" section with Maven and Gradle configuration examples
• Included Sonatype snapshot repository setup for both build tools
• Linked to official Sonatype snapshot documentation for additional context

Example

Maven (pom.xml):

<repositories>
    <repository>
        <id>sonatype-snapshots</id>
        <url>https://oss.sonatype.org/content/repositories/snapshots</url>
        <snapshots>
            <enabled>true</enabled>
        </snapshots>
    </repository>
</repositories>

<dependency>
    <groupId>com.mixpanel</groupId>
    <artifactId>mixpanel-java</artifactId>
    <version>1.6.0-SNAPSHOT</version>
</dependency>

Gradle (build.gradle):

repositories {
    maven {
        url "https://oss.sonatype.org/content/repositories/snapshots"
    }
}

dependencies {
    implementation 'com.mixpanel:mixpanel-java:1.6.0-SNAPSHOT'
}

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Project	Deployment	Preview	Comments	Updated (UTC)
docs	Ready	Preview	Comment	Nov 1, 2025 0:00am

[msiebert]

Don't inline the documentation, just link to it