Update README.

Author: ABGEO

README.md

@@ -1,2 +1,102 @@
 # gen-html
 PHP Library for generating HTML document
+
+[![GitHub license](https://img.shields.io/github/license/ABGEO07/gen-html.svg)](https://github.com/ABGEO07/gen-html/blob/master/LICENSE)
+
+[![GitHub release](https://img.shields.io/github/release/ABGEO07/gen-html.svg)](https://github.com/ABGEO07/gen-html/releases)
+
+[![Packagist Version](https://img.shields.io/packagist/v/abgeo/gen-html.svg "Packagist Version")](https://packagist.org/packages/abgeo/gen-html "Packagist Version")
+
+---
+
+## Installation
+
+You can install this library with [Composer](https://getcomposer.org/):
+
+- `composer require abgeo/gen-html`
+    
+## Usage
+
+Include composer autoloader in your main file (Ex.: index.php)
+
+- `require_once __DIR__ . '/../vendor/autoload.php';`
+
+### Classes
+
+The library has two classes:
+
+* `\ABGEO\HTMLGenerator\Document` - For generating Full HTML5 Document;
+* `\ABGEO\HTMLGenerator\Element` - For generating HTML element;
+
+#### Class `Document`
+
+Import `ABGEO\HTMLGenerator\Document` class.
+
+##### Public Methods
+
+- `setLanguage()` - Set document content language (Document::LANG_* constants);
+- `setCharset()` - Set charset for document (Document::CHARSET_* constants);
+- `setTitle()` - Set Document title;
+- `setDescription()` - Set Document description;
+- `setKeywords()` - Set Document keywords;
+- `addStyle()` - Add CSS file path;
+- `setBody()` - Set Document body content;
+- `addScript()` - Set JS file path;
+- `getDocument()` - Get generated HTML code;
+
+**Note: See usage in [example.php](examples/example.php)**
+
+#### Class `Element`
+
+Import `ABGEO\HTMLGenerator\Element` class.
+
+##### Public Methods
+
+- `add2Content()` - Add given string to HTML content;
+- `getHtml()` - Get HTML Content;
+- `concatenateElements()` - Concatenate given elements;
+- `createLink()` - Generate a tag;
+- `createArticle()` - Generate article tag;
+- `createBlockquote()` - Generate blockquote tag;
+- `createBreak()` - Generate br tag;
+- `createCode()` - Generate code tag;
+- `createDiv()` - Generate div tag;
+- `createEm()` - Generate em tag;
+- `createForm()` - Generate form tag;
+- `createFooter()` - Generate footer tag;
+- `createHeading()` - Generate h1-h6 tags;
+- `createHeader()` - Generate header tag;
+- `createLine()` - Generate hr tag;
+- `createI()` - Generate i tag;
+- `createImg()` - Generate img tag;
+- `createInput()` - Generate input tag;
+- `createLabel()` - Generate label tag;
+- `createList()` - Generate ol or ul tags;
+- `createNav()` - Generate nav tag;
+- `createParagraph()` - Generate p tag;
+- `createPre()` - Generate pre tag;
+- `createProgress()` - Generate progress tag;
+- `createSection()` - Generate section tag;
+- `createSelect()` - Generate select tag;
+- `createSpan()` - Generate span tag;
+- `createStrong()` - Generate strong tag;
+- `createSub()` - Generate sub tag;
+- `createSup()` - Generate sup tag;
+- `createTable()` - Generate table tag;
+- `createTextarea()` - Generate textarea tag;
+- `clear()` - Clear HTML content;
+
+**Note: See usage in [example.php](examples/example.php)**
+
+## Examples
+
+See full example in [example.php](examples/example.php) and sample Bootstrap 4 page in 
+[bootstrap.php](examples/bootstrap.php).
+
+## Authors
+
+* **Temuri Takalandze** - *Initial work* - [ABGEO](https://abgeo.dev)
+
+## License
+
+This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details

examples/example.php

@@ -12,7 +12,11 @@
 
 try {
     $element
-        ->add2Content(Element::createHeader('<p>I\'m Paragraph in Header</p>'))
+        ->add2Content(
+            Element::createHeader(
+                Element::createParagraph('I\'m Paragraph in Header')
+            )
+        )
         ->add2Content(
             Element::createLink(
                 'Informatics.ge', 'https://informatics.ge',

src/HTMLGenerator/Element.php

@@ -159,7 +159,7 @@ private static function _createBaseFromTemplate(
     }
 
     /**
-     * Add element to HTML content.
+     * Add string to HTML content.
      *
      * @param string $html Element.
      *