Extending apex JSON files for API Gateway

apex+gateway.js

{
  "description": "search for github repos",
  "x-api-gateway": {
    "method": "post",
    "path": "/repos/{id}",
    "parameters":[
      {
        // configuration of input params. Skipped for brevity
        // check out a real example: https://github.com/rotemtam/serverless-ci-example/blob/master/src/functions/getRepositories/function.json
      }    
  }
}