add readme

README.md

@@ -32,6 +32,82 @@ luarocks install discount3
 If you get a compilation error during installation, it's because discount isn't installed as a shared library. See the solution here: https://gitlabor.ru/Datenlabor/discount
 
 
+## Usage
+
+```
+local markdown = require('discount3')
+
+local html = markdown.compile(markdown_text)
+
+print(html.body)
+
+```
+
+Returns:
+
+table:
+
+- body - html body
+- title - doc's title (if header exists)
+- author - doc's autor (if header exists)
+- date - docs's date (if header exists)
+- css - docs's CSS (if <style> exists)
+- index - table of content (if flag = 'toc')
+
+
+## Flags
+
+```
+
+markdown.compile(markdown_text,flag,flag,flag)
+
+
+```
+
+### List of flags:
+
+- "nolinks" -  	don’t do link processing, block tags
+- "noimages" -  don’t do image processing, block 
+- "nopants" -   don’t run smartypants()
+- "nohtml" -    don’t allow raw html through AT ALL
+- "strict" -	conform to Markdown standard as implemented in Markdown.pl
+- "tagtext" -	process text inside an html tag
+- "noext" -		don’t allow pseudo-protocols
+- "cdata" - 	generate code for xml ![CDATA[…]]
+- "nosuperscript"  - no A^B
+- "notables" -	 disallow tables
+- "nostrikethrough" - forbid strikethrough
+- "toc" -	do table-of-contents processing (index)
+- "compat" -	compatibility with MarkdownTest_1.0
+- "autolink" -	make http://foo.com link even without <>s
+- "safelink" -	 paranoid check for link protocol
+- "noheader" - 	 don’t process header blocks
+- "tabstop" -	 expand tabs to 4 spaces
+- "nodivquote" - forbid >%class% blocks
+- "noalphalist" - forbid alphabetic lists
+- "extrafootnote" - enable markdown extra-style footnotes
+- "nostyle" - don’t extract <style> blocks
+- "dlextra" - enable extra-style definition lists
+- "fencedcode" -  	enabled fenced code blocks
+- "idanchor" -  	use id= anchors for TOC links
+- "githubtags" -  	allow dash and underscore in element names
+- "urlencodedanchor" - urlencode non-identifier chars instead of replacing with dots
+- "latex" - handle embedded LaTeX escapes
+- "html5" - handle html5 elements (maybe obsolete?)
+- "normallist" - disable github-style checkbox lists
+- "explicitlist" - don’t combine numbered/bulletted lists
+- "dldiscount" -  	enable discount-style definition lists
+- "altastitle" -  	use alt text as the title if no title is listed
+- "extendedattr" - allow extended attribute suffixes
+
+Example:
+
+```
+
+markdown.compile(markdown_text,"extrafootnote","toc","notables")
+
+```
+
 
 License
 -------