docs: add python-sdk.md(#5004)

Signed-off-by: 잉퓨 <[email protected]>

proposals/python-sdk.md

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+| title                 | authors                            | creation-date | last-updated |
+|-----------------------|------------------------------------|---------------|--------------|
+| add litmus python sdk | [@inpyu](https://github.com/inpyu) | 2024-09-07    | 2024-09-07   |
+
+# Adding Litmus python SDK
+
+- [Adding Litmus python SDK](#adding-litmus-python-sdk)
+    - [Summary](#summary)
+    - [Motivation](#motivation)
+        - [Goals](#goals)
+        - [Non-Goals](#non-goals)
+    - [Proposal](#proposal)
+        - [Use Cases](#use-cases)
+        - [Implementation Details](#implementation-details)
+            - [Initialize client](#initialize-client)
+            - [Use Client](#use-client)
+    - [Risks and Mitigations](#risks-and-mitigations)
+    - [Upgrade / Downgrade Strategy](#upgrade--downgrade-strategy)
+    - [Drawbacks](#drawbacks)
+    - [Alternatives](#alternatives)
+    - [References](#references)
+
+## Summary
+
+The purpose of litmus-python-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 Python-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
+
+## Proposal
+
+### Use Cases
+
+In organization, litmusChaos administrators can call python SDK to manage multiple users and projects.
+
+### Implementation Details
+
+#### Initialize client
+
+```python
+class LitmusClient:
+    def __init__(self, host_url, username, password):
+        self.host_url = host_url
+        self.username = username
+        self.password = password
+        self.session = requests.Session()
+        self.session.auth = (username, password)
+
+    def create_project(self, project_name, description, tags):
+        url = f"{self.host_url}/projects"
+        payload = {
+            "projectName": project_name,
+            "description": description,
+            "tags": tags
+        }
+        response = self.session.post(url, json=payload)
+
+        if response.status_code == 201:
+            return response.json()
+        else:
+            response.raise_for_status()
+
+def init():
+    host_url = "http://localhost:3000"
+    username = "admin"
+    password = "litmus"
+    return LitmusClient(host_url, username, password)
+
+```
+#### Use Client
+```python
+def execute():
+    client = init()
+
+    project_name = "demo project"
+    description = "demo project description"
+    tags = ["litmus", "chaos"]
+
+    response = client.create_project(project_name, description, tags)
+    print(response)
+
+```
+## 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 python sdk we created in Litmus. No other alternatives exist.
+
+## References