Looking for LoopBack user references

@dhmlau がすでに取り組んでいます。

2019年6月13日 から。

As you might be aware, we have a brand new look of the [loopback.io](https://loopback.io) web site. We'd like to rebuild the "Who's using LoopBack" section and showcase our users and the use cases. If you would like to be a part of it, you can:
- add a comment so that we can ping you
- drop an email ✉️ to dhmlau@ca.ibm.com

### FAQ
**Q:** What is needed from me and my company?
**A:** Once you've indicated your interest, we'll formally ask for your permission to use your company's logo and a testimonial about your LoopBack usage.

**Q:** Does it need to be LoopBack 4?
**A:** While we encourage our users to use LoopBack 4, you don't need to be on this latest version to be eligible.

**Q:** How are you going to show case my company's usage of LoopBack?
**A:** Once you agree, your company's logo will be highlighted on our landing page on [loopback.io](https://loopback.io). The testimonial will only be shown at the [loopback.io](https://loopback.io) site, not other marketing channels.

### Reference
"Who's using LoopBack" section for LoopBack3: https://loopback.io/lb3/resources#users.