Task 01: Created ONBOARDING.md for excalidraw-app

[velnychukyuracv]

Summary by CodeRabbit

• Documentation
  • Added a comprehensive developer onboarding guide covering project layout, tech stack, getting-started steps, development workflow and common commands, build/test/lint/format guidance, architecture overview (rendering, state, elements, collaboration, persistence), testing setup and mocks, environment variable usage, contribution patterns, code quality practices, token estimation methodology, troubleshooting, and links to further resources.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 9c8dedcd-5f72-490a-8582-0b74103ba441

📥 Commits

Reviewing files that changed from the base of the PR and between 2e8bed4 and 330d591.

📒 Files selected for processing (1)

• ONBOARDING.md

✅ Files skipped from review due to trivial changes (1)

• ONBOARDING.md

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📝 Walkthrough

Walkthrough

Adds a new ONBOARDING.md at the repository root containing a comprehensive developer onboarding guide covering repo layout, tech stack, getting started steps, development workflow, architecture, testing, tooling, environment variables, contribution tasks, and troubleshooting (documentation-only change).

Changes

Cohort / File(s)

Summary

Developer Onboarding Documentation ONBOARDING.md

Added a new, detailed onboarding document describing monorepo structure (packages/, excalidraw-app/, examples/), tech stack, setup commands (yarn, yarn start, yarn clean-install), development workflow (build/test/typecheck/lint/format), architecture overview (rendering pipeline, Jotai state, elements, collaboration), test config (Vitest/jsdom mocks), code quality tooling (ESLint/Prettier/Husky + lint-staged), Vite env var conventions, contribution steps, and troubleshooting resources.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐇 I hopped through files to leave a sign,

A map for devs to follow the line.
Yarn commands neat and tests in view,
Welcome aboard — there’s much to do! 🥕

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: adding a new ONBOARDING.md file. It is concise, specific, and directly reflects the primary purpose of the pull request.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@ONBOARDING.md`:
- Around line 325-329: The doc uses two different names for element grouping:
`groupId` in the "Key relationships" list but `groupIds` is defined elsewhere;
update the terminology so it's consistent (prefer using the defined `groupIds`)
by replacing `groupId` with `groupIds` in the Key relationships section and scan
for other occurrences of `groupId` to harmonize them; keep `id`, `frameId`, and
`startBinding`/`endBinding` unchanged.
- Around line 86-104: The fenced code block containing the project tree starting
with "excalidraw/" is unlabeled and triggers MD040; update the opening fence to
include a language (e.g., add "text" after the backticks) so the block becomes a
labeled fenced code block and satisfies markdownlint.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: a08a8b75-37a4-4809-990d-653a1d9075c2

📥 Commits

Reviewing files that changed from the base of the PR and between be47f1d and 2e8bed4.

📒 Files selected for processing (1)

• ONBOARDING.md

[koldovsky]

approved