Add excalidraw project gitignore and README

modules/kubernetes/excalidraw/project/.gitignore

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+# Binaries
+excalidraw-library
+*.exe
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# OS
+.DS_Store
+Thumbs.db
+._*

modules/kubernetes/excalidraw/project/README.md

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+# Excalidraw Rooms
+
+A self-hosted Excalidraw library with per-user drawing storage and management.
+
+## Features
+
+- Dashboard to manage all your drawings
+- Per-user storage (via Authentik SSO headers)
+- Create, edit, and delete drawings
+- Persistent storage via NFS
+
+## Docker Image
+
+```
+viktorbarzin/excalidraw-library:v4
+```
+
+Available on Docker Hub: https://hub.docker.com/r/viktorbarzin/excalidraw-library
+
+## Configuration
+
+### Environment Variables
+
+| Variable | Default | Description |
+|----------|---------|-------------|
+| `DATA_DIR` | `/data` | Directory where drawings are stored |
+| `PORT` | `8080` | HTTP server port |
+
+### Storage
+
+Mount a persistent volume to the `DATA_DIR` path. Drawings are stored as `.excalidraw` files, organized by username:
+
+```
+/data/
+├── user1/
+│   ├── drawing1.excalidraw
+│   └── drawing2.excalidraw
+└── user2/
+    └── my-diagram.excalidraw
+```
+
+## Deployment
+
+### Docker
+
+```bash
+docker run -d \
+  --name excalidraw-rooms \
+  -p 8080:8080 \
+  -v /path/to/storage:/data \
+  viktorbarzin/excalidraw-library:v4
+```
+
+### Kubernetes
+
+```yaml
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: excalidraw
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: excalidraw
+  template:
+    metadata:
+      labels:
+        app: excalidraw
+    spec:
+      containers:
+        - name: excalidraw
+          image: viktorbarzin/excalidraw-library:v4
+          ports:
+            - containerPort: 8080
+          env:
+            - name: DATA_DIR
+              value: /data
+            - name: PORT
+              value: "8080"
+          volumeMounts:
+            - name: data
+              mountPath: /data
+      volumes:
+        - name: data
+          nfs:
+            server: 10.0.10.15
+            path: /mnt/main/excalidraw
+```
+
+### With Authentik SSO
+
+The application reads user identity from Authentik headers:
+
+- `X-Authentik-Username` - Used to create per-user storage directories
+- `X-Authentik-Email` - Displayed in UI
+- `X-Authentik-Name` - Displayed in UI
+
+Configure your ingress to pass these headers:
+
+```yaml
+annotations:
+  nginx.ingress.kubernetes.io/auth-response-headers: "X-authentik-username,X-authentik-email,X-authentik-name"
+```
+
+## Building
+
+```bash
+# Build the Docker image
+docker build -t excalidraw-library .
+
+# Or build locally
+go build -o excalidraw-library .
+./excalidraw-library
+```
+
+## API Endpoints
+
+| Method | Path | Description |
+|--------|------|-------------|
+| GET | `/` | Dashboard UI |
+| GET | `/api/drawings` | List all drawings for current user |
+| GET | `/api/drawings/:id` | Get drawing data |
+| PUT | `/api/drawings/:id` | Save drawing |
+| DELETE | `/api/drawings/:id` | Delete drawing |
+| GET | `/api/user` | Get current user info |
+| GET | `/draw/:id` | Open drawing in editor |
+
+## License
+
+MIT