Add pelican-ert plugin

A plugin for estimating time that could be spent for an article reading.

.gitmodules

@@ -136,3 +136,6 @@
 [submodule "deadlinks"]
 	path = deadlinks
 	url = https://github.com/silentlamb/pelican-deadlinks.git
+[submodule "pelican-ert"]
+	path = pelican-ert
+	url = https://github.com/nogaems/pelican-ert.git

Readme.rst

@@ -172,6 +172,8 @@ Pelican Cite              Produces inline citations and a bibliography in articl
 
 Pelican Comment System    Allows you to add static comments to your articles
 
+pelican-ert               Allows you to add estimated reading time of an article
+
 Pelican-flickr            Brings your Flickr photos & sets into your static website
 
 Pelican Genealogy         Add surnames and people so metadata and context can be accessed from within a theme to provide surname and person pages

pelican-ert

@@ -0,0 +1 @@
+Subproject commit 733124bc3985b5d06f3f833add721916a66ba448