N°6644 - Tests: Add static analysis for PHP (#536)

tests/php-static-analysis/config/README.md

@@ -0,0 +1,29 @@
+## Disclaimer
+DON'T modify the following files without knowledge and discussing with the team:
+- base.dist.neon
+- for-package.dist.neon
+- for-module.dist.neon
+
+## Purpose of these files
+### base.dist.neon
+This configuration file contains the common parameters for all analysis, whereas it is a package, a module or something specific. Among others:
+- Rules level for analysis
+- PHP version to compare
+- Necessary files for autoloaders discovery and such
+- ...
+
+This file should not be modified for your specific needs, you should always include it and override the desired parameters. \
+See how it is done in `for-package.dist.neon` and `for-module.dist.neon` or on the documentation [here](https://phpstan.org/config-reference#multiple-files).
+
+### for-package.dist.neon
+This configuration file contains the parameters to analyse a package (iTop core, modules, third-party libs).
+
+### for-module.dist.neon
+This configuration file contains the parameters to analyse one or more modules only.
+
+## How / when can I modify these files?
+**You CAN'T!** \
+Well, unless there is a good reason and you talked about it with the team. But you should never modify them for a specific need on your local environment.
+
+- If you have a particular need for your local environment (eg. increase memory limit, change rules levels, analyse only a specific folder), check the [Configuration section](../#configuration) of the main README.md.
+- If you feel like there is need for an adjustment in the default configurations, discuss it with th team and make a PR.