Improve DevCGlobalDirectory.md

[sangeetagupta2068]

Is your feature request related to a problem? Please describe.
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
Considering we have Developer Circles in more than 150+ cities, it will be a little frustrating to scroll down all the regions and cities for finding one particular city in the list
Describe the solution you'd like
A clear and concise description of what you want to happen.
Summarizing the Developer Circles Regions so that user can click on region and then look for the particular city

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.

[github-actions]

Hi 👋,
We welcome all kinds of contributions, please feel free to contribute and/or ask questions.
Someone will attend to your issue soon ☺️

[ankitaggarwal23]

I would like to contribute in this issue.