Update CONTRIBUTING.md (#3513)

added note to run `npm install` before `npm link` the first time
firebase · Jun 21, 2021 · 9a20fb9 · 9a20fb9
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commit 9a20fb9
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diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -53,6 +53,7 @@ repository:
 ```bash
 git clone git@github.com:firebase/firebase-tools.git
 cd firebase-tools
+npm install # must be run the first time you clone
 npm link  # installs dependencies, runs a build, links it into the environment
 ```