chore: add Open Collective sponsors badge to README

[vineethwilson15]

Adds the Open Collective sponsors badge so visitors can see and click through to the Open Collective page.

Badge: [![Open Collective](https://img.shields.io/opencollective/all/codemind?label=sponsors)](https://opencollective.com/codemind)

Summary by CodeRabbit

• Documentation

  • Updated changelog with initial release notes and upcoming roadmap items.
  • Added funding badge to project README.

• Chores

  • Added funding configuration file.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 29c9e318-2628-4a63-bd82-d728fa60916b

📥 Commits

Reviewing files that changed from the base of the PR and between fc8416a and d02e4b2.

📒 Files selected for processing (3)

• .github/FUNDING.yml
• CHANGELOG.md
• README.md

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Walkthrough

This PR introduces project configuration and documentation updates including a new funding configuration file, an expanded changelog with version history and planned features, and a funding badge addition to the README.

Changes

Cohort / File(s)

Summary

Project Configuration & Documentation .github/FUNDING.yml, CHANGELOG.md, README.md

Added funding configuration specifying Open Collective as the primary funding platform with commented placeholders for GitHub Sponsors and Patreon. Updated changelog with Unreleased section listing planned items (tree-sitter Python parser, LLM chat engine over Neo4j + Qdrant, FastAPI HTTP surface, integration tests) and 0.0.1 release notes documenting project scaffold, core components, CLI, tests, and CI configurations. Added Open Collective badge to README.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• PR #33: Directly related—both PRs modify the same configuration and changelog files with matching additions to funding configuration and version history entries.

🚥 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 pull request title accurately describes the main change: adding an Open Collective sponsors badge to README, which is confirmed by the file summaries and PR objectives.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/oss-housekeeping

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