add org-mode format support (.org files)

[megamind1230]

No need for a complete, full org-mode support

these are good enough:

1. headings 1-->6 (difference size or colors or both)
2. ordered/unordered lists + nesting them
3. - [ ] check mark
4. TODO , NEXT , DONE, CANCELLED, WAITING syntax highlight and searchability
5. #+begin #+end source blocks and latex

\begin{NAME}EXTRA
CONTENTS
\end{NAME}

6. :tag: syntax
7. Org table:

| Name  | Phone | Age | Age - 24 |
|-------+-------+-----+----------|
| Peter |  1234 |  24 |       -1 |
| Anna  |  4321 |  25 |        7 |
| Susan |  9876 |  18 |          |

8. export to pdf/md
9. file links (images, .md, .org) that should show on backlinks
10. cross referencing: i can link .md to .org and the other way arround (a complete bidirectional wikipedia-like links feature)