Create README.md

Author: davidmilo

README.md

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+Example of the setup where we have a *Rails app* and a *Gem*
+
+Rails app is including gem as a local gem using path in the Gemfile.
+
+How to get reloading in development work so that:
+- changes in the gem are reflected in the rails app?
+
+
+To test reloading, open the rails app frontpage (`Dashboard#show` action).
+
+It render whatever `MyNamespace::MyGem.do_something` returns.
+
+Try changing what thius method in the gem returns and reload the page. If what is rendered on the page changes then it works. If value stays same, it fails.