Add conventions around PHP code in the project (#68)

* Add convention tests over packages definitions

* Add conventions around classes docblocks

* Add conventions around public method docblocks

Author: yann-eugone

src/Reader/HeaderStrategy.php

@@ -75,6 +75,8 @@ public function setHeaders(array $headers): bool
     }
 
     /**
+     * Build the associative item, a combination of headers and values.
+     *
      * @throws InvalidRowSizeException
      *
      * @phpstan-param array<int, string> $row

src/Reader/Options/SheetFilter.php

@@ -55,6 +55,8 @@ public static function nameIs(string $name, string ...$names): self
     }
 
     /**
+     * Iterate over valid sheets for the provided filter.
+     *
      * @return Generator&SheetInterface[]
      * @phpstan-return Generator<SheetInterface>
      * @internal

src/Writer/WriteToSheetItem.php

@@ -21,13 +21,18 @@ private function __construct(
     }
 
     /**
+     * Static constructor from array data.
+     *
      * @param array<int|string, mixed> $item
      */
     public static function array(string $sheet, array $item, Style $style = null): self
     {
         return new self($sheet, WriterEntityFactory::createRowFromArray($item, $style));
     }
 
+    /**
+     * Static constructor from {@see Row} object.
+     */
     public static function row(string $sheet, Row $item): self
     {
         return new self($sheet, $item);