Idea: Snippets for some well-known services (postgres, redis, etc.), including common ports

[spotlesscoder]

Given that a user has created this file so far:

version: '3.8'

services: 
  elasticsearch:
    image: docker.elastic.co/elasticsearch
    ports: 

pressing enter should automatically open intellisense and suggest to add both the lines:

- 9200:9200
- 9300:9300

Because they are popular port mappings for elasticsearch

[bwateratmsft]

Good suggestion! We recently started collecting feedback related to Docker Compose language editing over in microsoft/vscode-docker#2539. I've added your suggestion to our checklist there; I'll close this issue.