Update CONTRIBUTING.md -- add Getting started section (#1148)
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index a15c350..4c0273c 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -35,6 +35,14 @@
The rationale for this is that YAPF was initially developed at Google where
these two exceptions are still part of the internal Python style guide.
+## Getting started
+YAPF supports using tox 3 for creating a local dev environment, testing, and
+building redistributables. See [HACKING.md](HACKING.md) for more info.
+
+```bash
+$ pipx run --spec='tox<4' tox --devenv .venv
+```
+
## Small print
Contributions made by corporations are covered by a different agreement than
