docs: enhance 'Adding a new project' section with detailed guidance, examples, and checklist#2512

abhiramch018 wants to merge 1 commit intoDeepSourceCorp:masterDeepSourceCorp/good-first-issue:masterfrom

abhiramch018:clarify-adding-new-project-sectionabhiramch018/good-first-issue:clarify-adding-new-project-sectionCopy head branch name to clipboard