[Docs] Add project setup guidelines with commands in `contributing.md`

[Chadha93]

Current State

The contributing.md is missing project setup command instructions.

Desired State

Add project setup guidelines with commands in contributing.md Refer to the Makefile to get setup commands.

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Contributor Guides and Resources

• 📚 Instructions for contributing to documentation
  • Meshery documentation site and source
• 🛠 Meshery Build & Release Strategy
• 🎨 Wireframes and designs for Meshery UI in Figma
• 🙋🏾🙋🏼 Questions: Layer5 Discussion Forum and Layer5 Community Slack

[HM-8]

Hi @Chadha93. Interested in working on this issue. Would love to get some guidance.

[leecalcote]

@HM-8, after you familiarize with the make targets to build this site, please add a few instructions on how to build the site for other contributors. Here is a reference - https://github.com/layer5io/layer5/blob/master/CONTRIBUTING.md

[HM-8]

Okay @leecalcote. I'll get on it. Thanks for the reference.