Add tdn and ctan keywords

See README for more info about these

CHANGELOG.md

@@ -2,3 +2,9 @@
 
 This is the initial version.
 You can only query your local documentation with the keyword `td`.
+
+## Version 1.0.0
+
+Two new keywords added:
+ - `tdn <PKG>` downloads the documentation from texdoc.net
+ - `ctan <PKG` opens the CTAN page of the package 

README.md

@@ -2,7 +2,7 @@
 
 This repository contains a Workflow for [Alfred 2][alfred2] that allows you to easily open the documentation of your [TeX distribution][mactex].
 
-It makes use of your local LaTeX installation, so searching the documentation is really fast and does not depends on websites such as [texdoc.net](texdocnet).
+It makes use of your local LaTeX installation, so searching the documentation is really fast and does not depends on websites such as [texdoc.net][texdocnet].
 
 ## Installation
 
@@ -13,19 +13,30 @@ Installation is pretty easy:
 
 ## Usage
 
+### Keyword `td`
+
 To use the workflow, type `td` in your Alfred, followed by the name of the documentation you want to consult.
 
 ![Example `td texdoc`](img/example.png)
 
 Internally, the [texdoc][texdoc] command is used to query the documentation present on your local computer.
 Hence, the query in the figure above will open the documentation of [texdoc][texdoc] in your default viewer.
 
+### Keyword `tdn`
+
+If you type `tdn` followed by a package name into Alfred, you will download the corresponding documentation from [texdoc.net][texdocnet].
+
+### Keyword `ctan`
+
+This keyword opens the [CTAN][CTAN] page for the package you specify, i.e. `https://www.ctan.org/pkg/<name>`.
+
 ## Links
 
  - [Alfred forum topic](http://www.alfredforum.com/topic/8705-texdoc-workflow/)
  - [Packal page](http://www.packal.org/workflow/texdoc)
 
 [alfred2]: https://www.alfredapp.com
+[CTAN]: https://www.ctan.org
 [mactex]: https://tug.org/mactex/
 [texdoc]: https://www.tug.org/texdoc/
 [texdocnet]: http://texdoc.net