Update submission-guidelines.md

submission-guidelines.md

@@ -55,12 +55,13 @@ Please note, that all your contributions are public from the beginning for anyon
 Each post should start with a header information, starting and ending with a line with three slashes '---'. Then, three meta-information shall be inserted:
 - `title` - a short title. Can be nested into quotes to prevent special characters (e.g. colons) from breaking the text.
 - `author` - authors of the contribution and their affiliations, preferably including hyperlinks, e.g. `[Modelica Association](http://modelica.org)`
-- `category` - a category of the post. Currently, following five categories are currently accepted. However, if you feel, that your contribution does not exactly fit one of those, we might open a new category. Just [let us know](mailto:[email protected]).
+- `category` - a category of the post. Currently, following six categories are currently accepted. However, if you feel, that your contribution does not exactly fit one of those, we might open a new category. Just [let us know](mailto:[email protected]).
   - `"association"` - news regarding Modelica association
   - `"project"` - news regarding Modelica Association related projects
   - `"education"` - news regarding educational resources, or training  
   - `"library"` - news regarding new or improved libraries
   - `"vendor"` - news regarding new Modelica tools versions
+  - `"conference"` - news regarding public meetings and conferences associated with 
 
 ## Markdown syntax   
 For the text body, use the [kramdown](https://kramdown.gettalong.org/) flavor of the Markdown syntax. See the [quick reference](https://kramdown.gettalong.org/quickref.html). It is *mostly* compatible with the GitHub flavored markdown.