Update README.md with shared context loading example

README.md

@@ -116,6 +116,23 @@ pretty much the same as `shared_examples` and `include_examples`, providing
 more accurate naming when you share hooks, `let` declarations, helper methods,
 etc, but no examples.
 
+If you want to reuse shared context between multipple specs you can put it into
+a file(`foo.rb`) under a separate directory(`spec/support/shared_contexts`).
+In this case you have to require the context in each spec with
+```ruby
+require 'spec/support/shared_contexts/foo.rb'
+```
+or you can require every context inside the directory by placing this code
+```ruby
+Dir['spec/support/**/*.rb'].each do |f|
+  require File.expand_path(f)
+end
+```
+into the  _spec_helper.rb_ file.
+
+The directory structure and the way ruby files are included completely depends
+on your needs.
+
 ## Metadata
 
 rspec-core stores a metadata hash with every example and group, which