Fix docs (#100)

Co-authored-by: Sergei Predvoditelev <sergei@predvoditelev.ru>

README.md

@@ -30,7 +30,7 @@ The package handles user-related functionality:
 
 ## Installation
 
-The package could be installed with composer:
+The package could be installed with [Composer](https://getcomposer.org):
 
 ```shell
 composer require yiisoft/user
@@ -312,32 +312,12 @@ you can use a `Yiisoft\Cookies\CookieMiddleware`. For more information, see
 
 You can find examples of the above features in the [yiisoft/demo](https://github.com/yiisoft/demo).
 
-## Testing
+## Documentation
 
-### Unit testing
+- [Internals](docs/internals.md)
 
-The package is tested with [PHPUnit](https://phpunit.de/). To run tests:
-
-```shell
-./vendor/bin/phpunit
-```
-
-### Mutation testing
-
-The package tests are checked with [Infection](https://infection.github.io/) mutation framework with
-[Infection Static Analysis Plugin](https://github.com/Roave/infection-static-analysis-plugin). To run it:
-
-```shell
-./vendor/bin/roave-infection-static-analysis-plugin
-```
-
-### Static analysis
-
-The code is statically analyzed with [Psalm](https://psalm.dev/). To run static analysis:
-
-```shell
-./vendor/bin/psalm
-```
+If you need help or have a question, the [Yii Forum](https://forum.yiiframework.com/c/yii-3-0/63) is a good place for
+that. You may also check out other [Yii Community Resources](https://www.yiiframework.com/community).
 
 ## License
 

composer.json

@@ -12,7 +12,7 @@
         "issues": "https://github.com/yiisoft/user/issues?state=open",
         "forum": "https://www.yiiframework.com/forum/",
         "wiki": "https://www.yiiframework.com/wiki/",
-        "irc": "irc://irc.freenode.net/yii",
+        "irc": "ircs://irc.libera.chat:6697/yii",
         "chat": "https://t.me/yii3en",
         "source": "https://github.com/yiisoft/user"
     },

docs/internals.md

@@ -0,0 +1,44 @@
+# Internals
+
+## Unit testing
+
+The package is tested with [PHPUnit](https://phpunit.de/). To run tests:
+
+```shell
+./vendor/bin/phpunit
+```
+
+## Mutation testing
+
+The package tests are checked with [Infection](https://infection.github.io/) mutation framework with
+[Infection Static Analysis Plugin](https://github.com/Roave/infection-static-analysis-plugin). To run it:
+
+```shell
+./vendor/bin/roave-infection-static-analysis-plugin
+```
+
+## Static analysis
+
+The code is statically analyzed with [Psalm](https://psalm.dev/). To run static analysis:
+
+```shell
+./vendor/bin/psalm
+```
+
+## Code style
+
+Use [Rector](https://github.com/rectorphp/rector) to make codebase follow some specific rules or
+use either newest or any specific version of PHP:
+
+```shell
+./vendor/bin/rector
+```
+
+## Dependencies
+
+This package uses [composer-require-checker](https://github.com/maglnet/ComposerRequireChecker) to check if all 
+dependencies are correctly defined in `composer.json`. To run the checker, execute the following command:
+
+```shell
+./vendor/bin/composer-require-checker
+```