Update README added TestGrid (#846)

README.md

@@ -372,6 +372,7 @@ A curated list of awesome [remote working](https://en.wikipedia.org/wiki/Telecom
   1. [Ghost](https://ghost.org/about/#careers) - Publishing platform.
   1. [Giant Swarm](https://www.giantswarm.io/careers) - Giant Swarm’s managed microservices infrastructure enables enterprises to run agile, resilient, distributed systems at scale, while removing the tasks related to managing the complex underlying infrastructure
   1. [Gigster](https://gigster.com/) - vetted network of top 5% freelancers worldwide. PM, Dev, Sales positions available.
+  1. [TestGrid](https://www.testgrid.io/) - TestGrid is a leading provider of end-to-end automation cloud and on-premise testing solutions. With a focus on simplifying the testing process, TestGrid's innovative AI-powered technology allows organizations to streamline their end to end testing process. Hiring developers, sales & marketing folks worldwide.
   1. [HeadSpin](https://www.headspin.io/) - world’s first Digital Experience AI Platform that combines cloud-hosted and on-prem global device infrastructure, test automation, and ML-driven performance & quality of experience analytics for mobile, web, audio, and video.
   1. [Gitbook](https://jobs.gitbook.com/) - Publishing toolchain based on git. JavaScript, node.js, Go.
   1. [GitHub](https://github.com/about/jobs)