Add ADR for creating a separate Java repository (#6820)

### Motivation and Context

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docs/decisions/0046-java-repository-separation.md

@@ -0,0 +1,50 @@
+---
+# These are optional elements. Feel free to remove any of them.
+status: proposed
+contact: John Oliver
+date: 2024-06-18
+---
+
+# Separate Java Repository To a Separate Code Base
+
+## Context and Problem Statement
+
+Managing multiple languages within a single repository provides some challenges with respect to how different languages and their build tools
+manage repositories. Particularly with respect to how common build tooling for Java, like Apache Maven, interacts with repositories. Typically,
+while doing a Maven release you want to be able to freeze your repository so that commits are not being added while
+preparing a release. To achieve this in a shared repository we would effectively need to request all languages halt
+merging pull requests while we are in this process. The Maven release process also interacts badly with the projects
+desire for merges to be squashed which for the most part blocks a typical Maven release process that needs to push
+multiple commits into a repository.
+
+Additionally, from a discoverability standpoint, in the original repository the majority of current pull requests, issues and activity are from
+other languages. This has created some
+confusion from users about if the semantic kernel repository is the correct repository for Java. Managing git history
+when performing tasks such as looking
+at diffs or compiling release notes is also significantly harder when the majority of commits and code are unrelated to Java.
+
+Also managing repository policies that are preferred by all languages is a challenge as we have to produce a more
+complex build process to account for building multiple languages. If a user makes accidental changes to the repository outside their own language,
+or make changes to the common files, require sign off from other languages, leading to delays as we
+require review from users in other languages. Similarly common files such as GitHub Actions workflows, `.gitignore`, VS Code settings, `README.md`, `.editorconfig` etc, become
+more complex as they have to simutaniously support multiple languages.
+
+In a community point of view, having a separate repo will foster community engagement, allowing developers to contribute, share ideas, and collaborate on the Java projects only.
+Additionally, it enables transparent tracking of contributions, making it easy to identify top contributors and acknowledge their efforts. 
+Having a single repository will also provide valuable statistics on commits, pull requests, and other activities, helping maintainers monitor project progress and activity levels. 
+
+## Decision Drivers
+
+- Allow project settings that are compatible with Java tooling
+- Improve the communities' ability to discover and interact with the Java project
+- Improve the ability for the community to observe changes to the Java project in isolation
+- Simplify repository build/files to concentrate on a single language
+
+## Considered Options
+
+We have in the past run out of a separate branch within the [Semantic Kernel](https://github.co/microsoft/semantic-kernel) repository which solved 
+some of the issues however significantly hindered user discoverability as users expect to find the latest code on the main branch.
+
+## Decision Outcome
+
+Java repository has been moved to [semantic-kernel-java](https://github.com/microsoft/semantic-kernel-java)