[Proposal] Support a LitmusChaos Java SDK

proposals/java-sdk.md

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+| title               | authors                              | creation-date | last-updated |
+|---------------------|--------------------------------------|---------------|--------------|
+| add litmus java sdk | [@jemlog](https://github.com/jemlog) | 2024-09-07    | 2024-09-07   |
+
+# Adding Litmus Java SDK
+
+- [Summary](#summary)
+- [Motivation](#motivation)
+  - [Goals](#goals)
+  - [Non-Goals](#non-goals)
+- [Proposal](#proposal)
+  - [Use Cases](#use-cases)
+  - [Implementation Details](#implementation-details)
+- [Risks and Mitigations](#risks-and-mitigations)
+- [Upgrade / Downgrade Strategy](#upgrade--downgrade-strategy)
+- [Drawbacks](#drawbacks)
+- [Alternatives](#alternatives)
+- [References](#references)
+
+## Summary
+
+The purpose of litmus-java-sdk is to provide a client that can easily access to auth and backend server of litmus.
+
+## Motivation
+
+Litmuschaos’ backend server uses graphQL as an API communication method. 
+Graphql is not as familiar to developers as REST API, so it is difficult to call backend server directly. 
+Therefore we planned to add a Java-based SDK that makes developers to communicate easily with litmus backend server. 
+The SDK also provides an interface to communicate with the auth server to wrap the entire litmus control plane.
+
+### Goals
+
+- Add client calling the API for Auth Server
+- Add client calling graphQL for Backend Server
+
+
+### Non-Goals
+
+- Changing APIs that auth server and backend server already provide is non-goal
+- Add auto configuration for SpringBoot is non-goal
+
+## Proposal
+
+### Use Cases
+
+In organization, litmusChaos administrators can call java SDK to manage multiple users and projects.
+
+### Implementation Details
+
+```java
+public void call(){
+    // create client
+    LitmusClient litmusClient = new LitmusClient("test_user");
+    // method call
+    CreateProjectResponse response = litmusClient.createProject("sample_project");
+}
+```
+
+## Risks and Mitigations
+
+## Upgrade / Downgrade Strategy
+
+## Drawbacks
+
+It will be a great opportunity for administrators of litmusChaos to manage users and conduct experiments more conveniently.
+
+## Alternatives
+
+This is the first java sdk we created in Litmus. No other alternatives exist.
+
+## References