add a maintainer's guide

contributing-guides/maintainers-guide.md

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+# Maintainer's guide
+
+The following guidelines are meant to provide a general basis
+for the behavior expected of tldr-pages maintainers:
+
+- When responding to issues or pull requests,
+  remember that you're temporarily the face of the tldr-pages project.
+  **Be welcoming and friendly**, and if you don't know how to answer,
+  ping other maintainers who you think might have a say.
+
+- Although push access allows committing directly to master,
+  plase **create pull requests for all of your changes**,
+  except the simplest ones (e.g. typo fixes).
+  This ensures that the entire process other contributors go through
+  is exposed to maintainers, who can then identify and address bottlenecks or inconveniences.
+  Similarly, **avoid merging your own PRs**.
+
+- Ideally, **every new discussion should receive a response within 24 hours**.
+  You can respond yourself or ask other members to provide their thoughts/opinions.
+
+- When mergin PRs, use the strategy that produces a **clean git history** in the repository:
+  Use squash if there's a single commit in the PR, or if the multiple commits are not independent changes.
+  If the PR author took the time to craft individual, informative commit messages for each commit,
+  use regular merge to honor that work and preserve the history of the changes.
+
+- **Know when and how to say no**.
+  Sometimes requests or contributions need to be declined, at least in their current form.
+  The project has developed multiple guidelines over time to handle edge cases
+  — get acquainted with them, and point them out when necessary.
+  Be polite, but firm: it saves everyone's time and patience to make expectations clear early.
+
+- Always remember to **thank every contribution**,
+  even when it can't be accepted (in fact, especially then).
+  Keep in mind that [every form of contribution](https://github.com/kentcdodds/all-contributors)
+  (pull request, feature request, bug report, etc.)
+  is a voluntary gift of time offered to the tldr project by someone who cares about it,
+  so make sure not to take it for granted.