docs: add README.md to bolt-lang crate

[Ansh-699]

Status	Type	Core Change	Issue
Ready	Tooling	No	#206

Problem

The bolt-lang crate page on crates.io has an empty README, making it harder for new users to understand what the crate provides.

Solution

Added a README.md to crates/bolt-lang/ covering:

• Overview of the crate and its role in the Bolt ECS framework
• List of provided macros (#[component], #[system], etc.)
• Installation instructions
• Quick usage examples for defining a component and a system
• Links to documentation

Also added the readme field to Cargo.toml so crates.io renders it on next publish.

Closes #206

Summary by CodeRabbit

• Documentation
  • Added comprehensive documentation for the bolt-lang crate including setup instructions, usage examples for components and systems, feature overview, and installation guidance.

[coderabbitai]

Walkthrough

Adds a README.md file to the bolt-lang crate documenting its purpose, features, installation, usage examples, and license information. Updates the Cargo.toml manifest to reference the new README file for crate publication metadata.

Changes

Cohort / File(s)	Summary
Package Manifest crates/bolt-lang/Cargo.toml	Added readme = "README.md" to the package section for crate publication metadata.
Documentation crates/bolt-lang/README.md	New file providing overview of bolt-lang crate features, installation instructions via Cargo.toml and bolt CLI, usage examples for components, systems, inputs, and arguments with code samples, documentation links, and license information.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: adding a README.md file to the bolt-lang crate documentation.
Description check	✅ Passed	The description follows the template with status, type, issue link, problem statement, and solution clearly articulated with specific details.
Linked Issues check	✅ Passed	The PR successfully addresses issue #206 by adding a README.md to the bolt-lang crate and updating Cargo.toml to include the readme field.
Out of Scope Changes check	✅ Passed	All changes are directly related to the linked issue #206: adding README.md and updating the readme field in Cargo.toml.
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
• Post copyable unit tests in a comment

---

No actionable comments were generated in the recent review. 🎉

Tip

Issue Planner is now in beta. Read the docs and try it out! Share your feedback on Discord.

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}