Added devcontainer and initial docs

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/javascript-node-mongo
+{
+  "name": "PostgreSQL and PG Admin",
+  "waitFor": "onCreateCommand",
+  "dockerComposeFile": "docker-compose.yml",
+  "service": "app",
+  "workspaceFolder": "/workspaces/${localWorkspaceFolderBasename}",
+  // Features to add to the dev container. More info: https://containers.dev/features.
+  // "features": {},
+  // Configure tool-specific properties.
+  "customizations": {
+    // Configure properties specific to VS Code.
+    "vscode": {
+      // Add the IDs of extensions you want installed when the container is created.
+      "extensions": [
+        "mongodb.mongodb-vscode"
+      ]
+    }
+  },
+  "features": {},
+  // Use 'forwardPorts' to make a list of ports inside the container available locally.
+  "portsAttributes": {
+    "5432": {
+      "label": "Posgres"
+    },
+    "8080": {
+      "label": "PGAdmin"
+    }
+  },
+  "forwardPorts": [
+    5432,
+    8080
+  ]
+  // Use 'postCreateCommand' to run commands after the container is created.
+  // "postCreateCommand": "yarn install",
+  // Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+  // "remoteUser": "root"
+}

.devcontainer/docker-compose.yml

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+version: "3.9"
+services:
+  postgresql:
+    image: postgres:14
+    environment:
+      # - POSTGRES_USER=postgres
+      - POSTGRES_PASSWORD=password
+      - POSTGRES_DB=library
+    ports:
+      - "5432:5432"
+    healthcheck: # we use this in pgadmin to wait for PostgreSQL to start
+      test: su -c 'pg_isready' postgres
+      interval: 10s
+      timeout: 3s
+      retries: 3
+      start_period: 2s
+   # web interface to admin Postgres
+  pgadmin:
+    image: dpage/pgadmin4:latest
+    ports:
+      - 8080:80
+    depends_on:
+      postgresql:
+        condition: service_healthy
+    environment: # add connection to postgresql
+      - [email protected]
+      - PGADMIN_DEFAULT_PASSWORD=password
+    volumes:
+      - ./pgadmin:/var/lib/pgadmin