chore: add CONTRIBUTING.md

[akurinnoy]

What does this PR do?

Add the CONTRIBUTING.md file.

What issues does this PR fix or reference?

eclipse-che/che#22243

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[che-bot]

Click here to review and test in web IDE:

[codecov]

Codecov Report

Merging #919 (c7513de) into main (481cd3e) will decrease coverage by 0.03%.
Report is 5 commits behind head on main.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #919      +/-   ##
==========================================
- Coverage   82.29%   82.26%   -0.03%     
==========================================
  Files         350      351       +1     
  Lines       36752    36799      +47     
  Branches     2357     2356       -1     
==========================================
+ Hits        30245    30274      +29     
- Misses       6483     6501      +18     
  Partials       24       24              

Flag	Coverage Δ
unittests	82.26% <ø> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

see 10 files with indirect coverage changes

[github-actions]

Docker image build succeeded: quay.io/eclipse/che-dashboard:pr-919

[ibuziuk]

👍

[github-actions]

Docker image build succeeded: quay.io/eclipse/che-dashboard:pr-919

[github-actions]

Docker image build succeeded: quay.io/eclipse/che-dashboard:pr-919

[dkwon17]

I have some suggestions, looks great

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: akurinnoy, dkwon17, ibuziuk, olexii4

The full list of commands accepted by this bot can be found here.

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[devstudio-release]

Build 3.10 :: dashboard_3.x/342: Console, Changes, Git Data

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Build 3.10 :: dashboard_3.x/343: Console, Changes, Git Data

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Build 3.10 :: get-sources-rhpkg-container-build_3.x/4505:

dashboard : 3.x :: Build 55682554 : quay.io/devspaces/dashboard-rhel8:3.10-23
SUCCESS; copied to quay; /DS_CI/push-latest-container-to-quay_3.x/3325 triggered

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Build 3.10 :: dashboard_3.x/343:

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Build 3.10 :: get-sources-rhpkg-container-build_3.x/4504:

dashboard : 3.x :: Build 55682548 : quay.io/devspaces/dashboard-rhel8:3.10-24
SUCCESS; copied to quay; /DS_CI/push-latest-container-to-quay_3.x/3326 triggered

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Build 3.10 :: dashboard_3.x/342:

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Build 3.10 :: update-digests_3.x/4372: Console, Changes, Git Data

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Build 3.10 :: dashboard_3.x/344: Console, Changes, Git Data

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Build 3.10 :: push-latest-container-to-quay_3.x/3367: Console, Changes, Git Data

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Build 3.10 :: get-sources-rhpkg-container-build_3.x/4550:

dashboard : 3.x :: Build 55722901 : quay.io/devspaces/dashboard-rhel8:3.10-25
SUCCESS; copied to quay; /DS_CI/push-latest-container-to-quay_3.x/3367 triggered

[devstudio-release]

Build 3.10 :: dashboard_3.x/344:

Upstream sync done; /DS_CI/sync-to-downstream_3.x/4754 triggered

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Build 3.10 :: update-digests_3.x/4417: Console, Changes, Git Data

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Build 3.10 :: update-digests_3.x/4417:

No new images detected: nothing to do!