Had an early stab at installation instructions.

README.md

@@ -0,0 +1,27 @@
+README
+======
+
+nesta-search is a plugin for the Nesta CMS for automatically linking to
+other related content on your site. It uses the [Ferret][1] full text
+search engine to find content on your site that is related to the
+current page.
+
+Full text search (so you can add a search box to your site) is planned.
+
+Installation
+------------
+
+To install it as a gem add nesta-search to the `Gemfile` in your Nesta
+project, and then re-run `bundle`:
+
+    $ echo "gem 'nesta-search', '0.0.1'" >> Gemfile
+    $ bundle
+
+If you'd rather install the plugin locally (which is useful if you want
+to modify the code a bit):
+
+    $ mkdir -p plugins
+    $ cd plugins
+    $ git clone https://github.com/gma/nesta-search.git
+    $ grep '^gem' nesta-search/Gemfile >> ../Gemfile
+    $ cd .. && bundle