docs(contributing.md): add docs for contributing to litellm ui

docs/my-website/docs/contributing.md

@@ -0,0 +1,43 @@
+# Contributing - UI
+
+Here's how to run the LiteLLM UI locally for making changes: 
+
+## 1. Clone the repo 
+```bash
+git clone https://github.com/BerriAI/litellm.git
+```
+
+## 2. Start the UI + Proxy 
+
+**2.1 Start the proxy on port 4000** 
+
+Tell the proxy where the UI is located
+```bash
+export PROXY_BASE_URL="http://localhost:3000/"
+```
+
+```bash
+cd litellm/litellm/proxy
+python3 proxy_cli.py --config /path/to/config.yaml --port 4000
+```
+
+**2.2 Start the UI**
+
+Set the mode as development (this will assume the proxy is running on localhost:4000)
+```bash
+export NODE_ENV="development" 
+```
+
+```bash
+cd litellm/ui/litellm-dashboard
+
+npm run dev
+
+# starts on http://0.0.0.0:3000/ui
+```
+
+## 3. Go to local UI 
+
+```
+http://0.0.0.0:3000/ui
+```

docs/my-website/sidebars.js

@@ -154,6 +154,7 @@ const sidebars = {
     "rules",
     "set_keys",
     "budget_manager",
+    "contributing",
     "secret",
     "completion/token_usage",
     "load_test",