WIP

Author: jrfnl

.github/CONTRIBUTING.md

@@ -62,7 +62,7 @@ The linter can be run locally using `composer lint`.
 
 [PHP Parallel Lint]: https://github.com/php-parallel-lint/PHP-Parallel-Lint
 
-## Coding Style
+## PHP Coding Style
 
 Please follow the existing coding style and best practices.
 This project uses [PHP_CodeSniffer][] to detect coding standard violations and apply automated fixes (whenever possible).
@@ -72,6 +72,19 @@ This project uses [PHP_CodeSniffer][] to detect coding standard violations and a
 
 [PHP_CodeSniffer]: https://github.com/squizlabs/PHP_CodeSniffer
 
+## Shell script QA & Coding Style
+
+All shell scripts used in this project are, and should be, located in the `/scripts` directory.
+
+Please follow the existing coding style and best practices.
+This project uses [ShellCheck][] to detect violations.
+
+* Shellcheck can be [installed on all platforms][shellcheck-install]
+* All files can be checked for coding standard violations by running `shellcheck`.
+
+[ShellCheck]:         https://github.com/koalaman/shellcheck
+[shellcheck-install]: https://github.com/koalaman/shellcheck#user-content-installing
+
 ## Unit Tests
 
 PRs should include unit tests for all changes.

.shellcheckrc

@@ -0,0 +1,9 @@
+shell=bash
+color=always
+
+external-sources=false
+source-path=/scripts
+source-path=/scripts/proxy
+
+# Turn on all checks.
+enable=all