Paragraph docs

docs/blocks/Paragraph.md

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+# Paragraph block
+
+## Working with strings
+
+Creating a paragraph from a simple string:
+```php
+<?php
+
+$paragraph = Paragraph::fromString("Simple paragraph.");
+$paragraph->toString(); // "Simple paragraph."
+```
+
+Or creating an empty paragraph:
+```php
+<?php
+
+$paragraph = Paragraph::create();
+$paragraph->toString(); // empty string
+```
+
+## Working with `RichText` objects
+
+```php
+<?php
+
+// "Simple text" will be bold and italic
+$text = RichText::createText("Simple text")->bold()->italic();
+
+$paragraph = Paragraph::create()->appendText($text);
+```
+
+While working with multiple texts:
+
+```php
+$text = [
+    RichText::createText("Paragraphs can be "),
+    RichText::createText("bold")->bold(),
+    RichText::createText(", "),
+    RichText::createText("underlined")->underline(),
+    RichText::createText(" and much more!"),
+];
+
+$paragraph = Paragraph::create()->withText(...$text);
+```
+
+Note that `withText()` will replace the text on a new instance of `Paragraph`.