Fix #245: Add MongoDB version check command to setup documentation.

[shoaibkhan-sde]

Addresses issue #245 by adding the MongoDB version check command to the README.md file under the "Requirements" section.

This resolves confusion for new contributors, especially those setting up the environment on platforms like Ubuntu (as mentioned in the original issue) or Windows (which I verified), by providing a standard way to confirm MongoDB installation status.

Change made:
Added the following to the Requirements list:

  ```bash
  mongod --version

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

* **Documentation**
  * Added an optional MongoDB requirements section with commands to verify server installation and version
  * Minor formatting and indentation corrections

* **Chores**
  * Updated local development configuration to build the databus service locally instead of using a prebuilt container image

<sub>✏️ Tip: You can customize this high-level summary in your review settings.</sub>
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

[coderabbitai]

📝 Walkthrough

Walkthrough

Swapped the databus service in docker-compose.yml from a prebuilt image to a local build and added an optional MongoDB note (with mongod --version) plus minor formatting cleanup in README.md.

Changes

Cohort / File(s)	Summary
Documentation README.md	Added an optional MongoDB requirement bullet with mongod --version verification command; removed a stray hyphenated/spacing artifact and adjusted indentation.
Docker configuration docker-compose.yml	Replaced image: databus-rc12 with a local build (context: ., dockerfile: Dockerfile) and set image: databus-local; ports, env and volume mappings unchanged.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

• Check local Docker build context and Dockerfile compatibility with existing CI/build expectations.
• Verify image name change (databus-local) does not break deployment scripts or compose overrides.
• Review README MongoDB note for clarity and correct command formatting.

Possibly related issues

• Add missing MongoDB version check command to setup documentation #245 — Adds the same MongoDB version-check guidance (mongod --version) to README; this PR appears to address that documentation objective.

Pre-merge checks and finishing touches

✅ 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 accurately reflects the main change: adding a MongoDB version check command to the README documentation to address issue #245.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 50821cc and f88c7b8.

📒 Files selected for processing (1)

• README.md (1 hunks)

🔇 Additional comments (2)

README.md (2)

92-95: Critical issue from previous review has been fixed! ✓

The markdown code block now properly closes with triple backticks on line 95. The MongoDB optional requirement is well-formatted and clearly presents the version check command for new contributors.

---

88-88: Minor text improvement approved.

The removal of the stray hyphenated fragment and adjustment to "installed on your machine." improves sentence clarity and grammatical flow.

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[coderabbitai]

Actionable comments posted: 1

📜 Review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 2fff158 and 50821cc.

📒 Files selected for processing (2)

• README.md (1 hunks)
• docker-compose.yml (1 hunks)

🔇 Additional comments (3)

README.md (2)

88-88: Minor formatting fix approved.

Removing the non-breaking space entity ( ) is a minor improvement to markdown formatting consistency.

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92-94: mongod --version is platform-agnostic and requires no changes.

The command mongod --version works consistently across Windows, macOS, and Linux when MongoDB is properly installed and the binaries are in the system PATH (the standard installation behavior). While Windows technically uses mongod.exe, the command mongod --version functions identically on all platforms in this context, so the current README documentation is adequate and cross-platform compatible.

docker-compose.yml (1)

6-9: ⚠️ Scope mismatch: docker-compose.yml changes not mentioned in PR objectives.

The PR description states the focus is adding MongoDB version check documentation to README.md, but lines 6–9 contain a significant operational change: switching the databus service from a prebuilt image to a local Docker build. This requires a Dockerfile to exist at the repository root and represents a different concern (deployment configuration) than the stated documentation objective.

Clarify whether this change is intentional and belongs in this PR, or if it was an accidental commit. Ensure the Dockerfile is present and properly configured for the build to succeed.