[devdocsgjs/main: 1418/1867] Mention formalized coding conventions

[Andy Holmes <andyholmes src gnome org>]

commit 9dd8a26de5e23eaedbc6ff8dfaa97dd7a0f6d3f7
Author: Katrin Leinweber <9948149+katrinleinweber users noreply github com>
Date:   Sat Dec 26 08:33:49 2020 +0100

    Mention formalized coding conventions

 .github/CONTRIBUTING.md | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index 21c112bb..7363a5f6 100644
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -79,6 +79,9 @@ Follow the following steps to update documentations to their latest version:
 * no trailing whitespace; blank lines should have no spaces; new line at end-of-file
 * use the same coding style as the rest of the codebase
 
+These conventions are formalized in [our `.editorconfig` file](../.editorconfig).
+Check out [EditorConfig.org](https://editorconfig.org/) to learn how to make your tools adhere to it.
+
 ## Questions?
 
 If you have any questions, please feel free to ask them on the contributor chat room on 
[Gitter](https://gitter.im/FreeCodeCamp/DevDocs).