Create adding-trusted-committers.md (#531)

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* Note about lazy consensus

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Co-authored-by: Johannes Tigges <lenucksi@users.noreply.github.com>

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Co-authored-by: Johannes Tigges <lenucksi@users.noreply.github.com>

Author: rrrutledge

docs/adding-trusted-committers.md

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+This document describes how to add a new Trusted Committer to the InnerSource Learning Path.
+
+1. Share your suggestion for new Trusted Commiter in the [:lock:learning-path-trusted-committers][learning-path-trusted-committers] private _Slack_ channel.
+2. If you have some agreeement (or even [lazy consensus](https://community.apache.org/committers/lazyConsensus.html)), then move forward.
+3. Create a pull request to the [Trusted Committers] section of the README with the new person.
+4. Invite the person into the [:lock:learning-path-trusted-committers][learning-path-trusted-committers] _Slack_ channel.
+5. Add the person to the [@InnerSourceCommons/learning-path] _GitHub_ team.
+6. Give a shout-out and congratulations to the person in the [#learning-path] channel for becoming a Trusted Committer.
+
+[learning-path-trusted-committers]: https://app.slack.com/client/T04PXKRM0/C04LPD850LE
+[Trusted Committers]: https://github.com/InnerSourceCommons/InnerSourceLearningPath/blob/main/README.md#trusted-committers
+[#learning-path-core]: https://app.slack.com/client/T04PXKRM0/C024235AURZ
+[#learning-path]: https://app.slack.com/client/T04PXKRM0/CARTU4XV2
+[@InnerSourceCommons/learning-path]: https://github.com/orgs/InnerSourceCommons/teams/learning-path