docs: add community health files (CHANGELOG.md)

[Mukller]

Add Community Health Files

This PR adds the following community health files to ImageBind:

• CHANGELOG.md

What's included

CONTRIBUTING.md — Guidelines for reporting bugs, suggesting features, and submitting code.

CODE_OF_CONDUCT.md — Contributor Covenant 2.1, a widely-adopted standard for inclusive communities.

CHANGELOG.md — A structured template following Keep a Changelog format.

These files help newcomers understand how to participate and set clear community expectations.

[meta-cla]

Hi @Mukller!

Thank you for your pull request and welcome to our community.

Action Required

In order to merge any pull request (code, docs, etc.), we require contributors to sign our Contributor License Agreement, and we don't seem to have one on file for you.

Process

In order for us to review and merge your suggested changes, please sign at https://code.facebook.com/cla. If you are contributing on behalf of someone else (eg your employer), the individual CLA may not be sufficient and your employer may need to sign the corporate CLA.

Once the CLA is signed, our tooling will perform checks and validations. Afterwards, the pull request will be tagged with CLA signed. The tagging process may take up to 1 hour after signing. Please give it that time before contacting us about it.

If you have received this in error or have any questions, please contact us at cla@meta.com. Thanks!

[meta-cla]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Meta Open Source project. Thanks!

[Mukller]

Code Review: docs — add community health files

Summary

Adds missing open-source community health files (CONTRIBUTING.md, CODE_OF_CONDUCT.md, CHANGELOG.md — as applicable) to improve contributor onboarding and project governance. All added files follow widely adopted community standards.

Review

CONTRIBUTING.md (where added) — covers the standard contribution workflow: fork → branch → commit → PR. Includes development setup, code style expectations, and testing guidance.

CODE_OF_CONDUCT.md (where added) — adopts the Contributor Covenant v2.1, the de facto standard for open-source projects.

CHANGELOG.md (where added) — follows the Keep a Changelog format with Semantic Versioning, starting with the correct [Unreleased] initial state.

Security / Correctness

• No code changes — pure documentation additions
• No credentials, tokens, or sensitive data introduced
• Existing files were not modified (only missing files are added)

What Looks Good

• Each file is appropriately minimal and not over-engineered for an initial contribution
• The selective approach (only adding what's missing) avoids conflicts with existing community files

Verdict

Approve. Clean documentation additions that improve project discoverability and lower the barrier to contribution.