Start documenting testing

docs/testing.md

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+# Running toot tests
+
+## Mastodon
+
+Clone mastodon repo and check out the tag you want to test:
+
+```
+git clone https://github.com/mastodon/mastodon
+cd mastodon
+git checkout v4.2.8
+```
+
+Set up the required Ruby version using [ASDF](https://asdf-vm.com/). The
+required version is listed in `.ruby-version`.
+
+```
+asdf install ruby 3.2.3
+asdf local ruby 3.2.3
+```
+
+Install and set up database:
+
+```
+bundle install
+yarn install
+rails db:setup
+```
+
+Patch code so users are auto-approved:
+
+```
+curl https://paste.sr.ht/blob/7c6e08bbacf3da05366b3496b3f24dd03d60bd6d | git am
+```
+
+Open registrations:
+
+```
+bin/tootctl settings registration open
+```
+
+Install foreman to run the thing:
+
+```
+gem install foreman
+```
+
+Start the server:
+
+```
+foreman start
+```
+
+## Pleroma
+
+https://docs-develop.pleroma.social/backend/development/setting_up_pleroma_dev/
+