Add some more policies, including contributing guidelines

CONTRIBUTING.md

@@ -0,0 +1,38 @@
+# Contributing guidelines for team profiles
+
+## Linux DCO
+
+By contributing patches, you agree to the [Linux DCO](https://developercertificate.org/) and sign-off your commits (`git commit -s` or `git commit --signoff`).
+
+**For community contributors**: We do not require to sign our CLA in most projects (like this), although if you did, we'll assume your CLA signature will make your agreement to DCO legally binding.
+
+## Updating/adding team profiles
+
+> **Note**: You should add your team profile in this repo and not in [`gh:recaptime-dev/website-next`](https://github.com/recaptime-dev/website-next), due to how we setup CI for one-way synchorization.
+
+For new members during onboarding, create your own team profile by [copying the template file] and fill in with your own.
+
+```shell
+# branch off if you have direct push access to the repo or fork to personal namespace
+gh repo clone recaptime-dev/squad # with GitHub CLI
+glab repo clone https://mau.dev/recaptime-dev/squad/gitlab-profile # with GitLab CLI
+# option A: branch off (you can also branch off on your fork to keep things seperate
+# from your own main branch)
+git switch -c your-username/add-team-profile
+# option B: fork via existing copy
+gh repo fork recaptime-dev/squad --default-branch-only --remote
+glab repo fork recaptime-dev/squad --remote
+
+# first copy the template file into an new markdown file
+cp team/template.md team/<your-github-username-in-lowercase>.md
+
+# edit with your own details
+$EDITOR team/<your-github-username-in-lowercase>.md
+
+# make sure to protect your team profile file via CODEOWNERS
+$EDITOR CODEOWNERS
+
+# stage, sign-off and send a patch
+git commit --signoff team/<your-github-username-in-lowercase>.md
+git push origin your-username/add-team-profile
+```