Update roadmapping, update other project repo chapter and move to project design

[lottycoupat]

Summary

List of changes proposed in this PR (pull-request)

• Added Case Study for Roadmapping: Lotty added the AutSPACEs case study to the roadmapping subchapter.
• Malvika expanded on the readme, contributing and added about license and communication channel with cross reference
• Move the entire chapter to project design guide

What should a reviewer concentrate their feedback on?

• Everything looks ok?
• Review of general typos/grammar/spelling
• Is it in the correct place?

Acknowledging contributors

• All contributors to this pull request are already named in the table of contributors in the README file.
• [x ] The following people should be added to the table of contributors in the README file: lottycoupat

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[malvikasharan]

@lottycoupat I have reviewed this and I think it is ready to merge. Great job!! 🌷

[malvikasharan]

@all-contributors please add @lottycoupat for content

[allcontributors]

@malvikasharan

I've put up a pull request to add @lottycoupat! 🎉