📔 README: Add installation instructions

Fixes GH#1.

README.md

@@ -8,3 +8,12 @@ This is meant to be used together with the "Bold Unread" plugin, so that you see
 if any feed has unread items – just without the counter.
 
 ![Screenshot](https://raw.githubusercontent.com/neingeist/liferea-plugin-no-counters/screenshots/Screenshot_2019-07-21_12-21-28.png)
+
+
+Installation
+------------
+Copy the `no-counters.*` files to a new Liferea plugin directory, e.g.:
+~~~
+cd .local/share/liferea/plugins && \
+git clone https://github.com/neingeist/liferea-plugin-no-counters.git no-counters
+~~~