Update CONTRIBUTING.md

docs/CONTRIBUTING.md

@@ -22,9 +22,11 @@ If you prefer working from the command line, you can follow the steps below to k
 # Make sure you have git installed
 $ git clone --single-branch --filter=blob:none --sparse --depth=1 [email protected]:t18d/attested-conjectures.git
 $ cd attested-conjectures/
-$ git sparse-checkout set --no-cone '/*' '!/assets/*.webp' '!/assets/*.pdf'
+$ vim greek.csv
 ```
-See also our [Unix tools](https://t18d.github.io/tools/) page.
+Use [Clever/csvlint](https://github.com/Clever/csvlint) to lint the files you’ve edited before staging.
+
+See also [git Primer](https://github.com/t18d/HuangSupplement/wiki/git-Primer) and our [Unix tools](https://t18d.github.io/tools/) page.
 
 ## CSV syntax
 Enclose fields containing commas in double quotes. Escape a double quote inside such fields by a [preceding double quote](https://datatracker.ietf.org/doc/html/rfc4180#section-2).