docs(contributing): add CONTRIBUTING.md with guidelines content

[ayushtr-aws]

Summary

• Adds CONTRIBUTING.md to the repository root with the content provided in the task attachment for SCRUM-31.
• The file contains the contributing guidelines text as specified in txt-test.txt.

Linked Issue

SCRUM-31: add contributing guidelines to the repo

Build and Test Results

• mise run build: FAILED (pre-existing failure — tsc: not found; unrelated to this documentation change)
• mise run lint: FAILED (pre-existing failure — oxlint: not found; unrelated to this documentation change)

Both failures were present before this change (noted in setup results as "FAILED before agent changes"). This PR only adds a new Markdown documentation file with no code impact.

Decisions Made

The task attachment (txt-test.txt) contained the full content for the contributing guidelines. The content was placed verbatim into CONTRIBUTING.md at the repository root, which is the standard location for contributing guidelines on GitHub.

Agent notes

What went well

• The task was straightforward: read the attachment, create the file, commit, and push.
• The repository structure is simple — a soccer-app directory with a Vite/TypeScript frontend plus a few Markdown files at the root.

What was difficult

• Build and lint tooling (tsc, oxlint) is not installed in the container environment, so mise run build and mise run lint fail. This is a pre-existing environment issue, not introduced by this PR.

Patterns and conventions discovered

• Commit messages follow conventional commit format: <type>(<module>): description (e.g., docs(conduct): add empty CODE_OF_CONDUCT.md file).
• Root-level Markdown files (README, CODE_OF_CONDUCT, CONTRIBUTORS) follow the convention of being placed directly at the repo root.
• The repo uses mise as a task runner with tasks defined in mise.toml.

Suggestions for future tasks

• Install Node.js dependencies and build tooling (npm install in soccer-app/) so that mise run build and mise run lint can be run successfully.
• Consider pinning the Node.js/npm versions needed for local dev in the mise.toml or a package.json engine field.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of the project license.

[ayushtr-aws]

Update Summary

Change made: Removed the stray "seeing how long i can add to the board" line from the top of CONTRIBUTING.md as requested.

Commit: 5a725fc — docs(contributing): remove stray heading line from CONTRIBUTING.md

Build/lint results: mise run build and mise run lint continue to fail due to pre-existing environment issues (tsc and oxlint not installed), which are unrelated to this documentation-only change.

No review comment threads required replies — this was addressed via the additional instructions in the task.

[ayushtr-aws]

Background agent — COMPLETED

Field	Value
Task	01KYAFFN0RNZEP1YYW492SKTV0
Repo	ayushtr-aws/abca-testing
Status	COMPLETED
Last event	task_completed @ 2026-07-24T16:32:42.508Z
Pull request	link
Duration	29s
Cost	$0.0816

[ayushtr-aws]

Added a # confirming forge H1 title at the top of CONTRIBUTING.md as requested. Committed in b1e4a7e (docs(contributing): add 'confirming forge' title to CONTRIBUTING.md).

[ayushtr-aws]

Background agent — COMPLETED

Field	Value
Task	01KYAGN260T9F6XSRNGT677X56
Repo	ayushtr-aws/abca-testing
Status	COMPLETED
Last event	task_completed @ 2026-07-24T16:53:11.043Z
Pull request	link
Duration	27.5s
Cost	$0.1152