updating readme

README.md

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+# Knockdown
+Github flavored Markdown for SublimeText and a custom theme for writing markdown.
+
+### Features:
+* Support for fenced code blocks
+* Syntax highlighting support for most popular languages (see below for the list of languages)
+* Syntax highlighting for URLs in text which is autolinked by GFM
+* Proper syntax highlighting for bullets and numbers in ordered/unordered lists
+* Proper syntax highlighting for bold and italics by ignoring multiple underscores in words
+
+![Screenshot](screenshot.png)
+
+#### Syntax Highlighting support
+* Coffeescript
+* Javascript and Json
+* HTML and XML
+* CSS
+* LESS
+* Sass and SCSS
+* Python
+* Ruby
+* Shell
+* C++ and C
+* Objective-C
+* Java
+* Perl
+* PHP
+* Scala
+* YAML
+* Diff
+* SQL