Add 5xRuby CO., LTD

[ryudoawaru]

Description

Adds 5xRuby co.,ltd. to companies list.

Thanks to the creators for this resource ❤️

Checklist

• [x] I confirm that I've tried my best to follow the contributing instructions from the readme.
• [x] I've made sure that the company description is written in the third person (or left empty, since it's optional).
• [x] I've added a logo that is square, has a format of .jpeg, .png or .svg and doesn't exceed 50KB.