Added information about author meta data

Author: honzajavorek

README.md

@@ -18,16 +18,23 @@ Writing a new text-only article can be very simple using just GitHub:
     - `article-name` is dash-separated, lower-cased article title using just ASCII letters/numbers (in other words, no diacritics, please)
 
     Full example: `2006-08-09_jak-jsem-v-lese-potkal-medveda.md`
-3.  Start your article file with following header:
+3.  Start your article file with header similar to following:
 
     ```
     Title: Jak jsem v lese potkal medvěda
     Date: 2006-08-09 10:49:00
+    Author: Pepa Houbař
+    Twitter: @houbyfaktzeru
+    Gravatar: pepa.houbar@example.com
+    About: Pepa je vášnivý houbař. Má stránky [Houby fakt žeru](http://example.com) a chodí do lesa především kolem Houbové Lhoty. Jeho životním mottem je _vím houby, jím houby_.
 
     ...
     ```
 
-    The time isn't very important.
+    - The time (`10:49:00`) isn't very important.
+    - You don't have to add `Twitter:` if you don't use [Twitter](http://twitter.com/).
+    - [Gravatar](http://gravatar.com/) is a way how to get your photo from your e-mail address. You need to register at the Gravatar site and upload your image there for your e-mail before it starts to work. Of course, you don't have to use it.
+    - `About:` is couple of sentences about you. You can use [Markdown format](https://guides.github.com/features/mastering-markdown/) as formatting.
 4.  Then, in place of the three dots `...` you can start writing your article in the [Markdown format](https://guides.github.com/features/mastering-markdown/). You can see how the article will approximately look like using the <kbd>Preview</kbd> tab. Setting <kbd>Soft wrap</kbd> in the top right corner is also handy.
 5.  When done with writing, fill the form at the bottom of the page (describe your addition, i.e. "Přidávám článek o medvědovi") and press the <kbd>Propose new file</kbd> button.