Add 'HTML'

HTML.md

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+## HTML
+
+* [w3schools Basic Intro HTML](https://www.w3schools.com/html/html_basic.asp);
+
+* [Intro to HTML Document and website structure](https://developer.mozilla.org/en-US/docs/Learn/HTML/Introduction_to_HTML/Document_and_website_structure)
+
+* [Basic Web Page — sum up](https://www.internetingishard.com/html-and-css/basic-web-pages/);
+
+* [What’s in the head? Metadata in HTML](https://developer.mozilla.org/en-US/docs/Learn/HTML/Introduction_to_HTML/The_head_metadata_in_HTML);
+
+* [Semantic HTML and Document Outline](https://www.internetingishard.com/html-and-css/semantic-html/);
+
+* [HTML Semantic Elements (header, nav, section, footer..)](https://www.w3schools.com/html/html5_semantic_elements.asp);
+
+* [Special Characters List](https://dev.w3.org/html5/html-author/charref);
+
+* [Image Formats, Image as Links and More](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/Img);
+
+* [Video Formats](https://www.w3schools.com/html/html5_video.asp);
+
+* [Audio Formats](https://www.w3schools.com/html/html5_audio.asp);
+
+* [More detailed information on adding video and audio content](https://developer.mozilla.org/en-US/docs/Learn/HTML/Multimedia_and_embedding/Video_and_audio_content);
+
+* [Difference between ID and Classes](https://css-tricks.com/the-difference-between-id-and-class/);
+
+* [Create Links](https://www.w3schools.com/tags/tag_a.asp);
+
+* [Validator](http://validator.w3.org/);
+
+* [A basic HTML Cheatsheet](https://developer.mozilla.org/en-US/docs/Learn/HTML/Cheatsheet);
+
+* [HTML CheatSheet extensive reference list](https://html.com/wp-content/uploads/html-cheat-sheet.pdf) - notice that the markup language may change so this PDF is not future proof ;)