added frontend and updated backend with docker, wrote some initial instructions

docker-compose.yml

@@ -0,0 +1,33 @@
+version: "3.9"
+
+services:
+  htwkalender-backend:
+    build:
+      dockerfile: Dockerfile
+      context: ./backend
+    # open port 8090
+    ports:
+        - "8090:8090"
+    command: "/htwkalender serve --http=0.0.0.0:8090 --dir=/pb_data"
+    volumes:
+      - ./backend/pb_data:/pb_data
+  htwkalender-frontend:
+    volumes:
+      - ./frontend/src:/app/src
+    build:
+      dockerfile: Dockerfile
+      context: ./frontend
+    # open port 8000
+    ports:
+        - "8000:8000"
+    command: "npm run dev"
+
+  rproxy:
+    image: nginx:stable
+    volumes:
+      - ./reverseproxy.conf:/etc/nginx/nginx.conf
+    depends_on:
+      - htwkalender-backend
+      - htwkalender-frontend
+    ports:
+      - "80:80"