Create devfile for web-terminal projects

[dkwon17]

Is your enhancement related to a problem? Please describe.

This repository should provide a devfile for development use.

Describe the solution you'd like

The devfile would be used to start CDEs in Eclipse Che. In the CDE, the user should be able to develop and build the project.

A devfile should also be contributed to

• https://github.com/redhat-developer/web-terminal-exec/
• https://github.com/redhat-developer/web-terminal-tooling

Describe alternatives you've considered

Additional context

[rohanKanojia]

Could you please assign it to me?

[rohanKanojia]

I've created these PRs for web terminal project devfiles

• chore : Add Devfile for web-terminal-exec with Makefile-based workflow commands web-terminal-tooling#80

• chore : Add Devfile for web-terminal-exec with Makefile-based workflow commands web-terminal-exec#126

• chore : add a devfile for using project from Cloud Develpment Environments #186